40 gallons breeder tank for fancy goldfish

Hello everyone, my name is Tung, a completely newbie in this fish keeing business. Before start asking questions, I would like to share my little story first:

I'm a semi-pro photographer and as my home studio was completed last month, I decided to get a fish bowl as prop and this was the starting point. With a completely 0 background knowledge, I went to a small fish shop nearby and bought a bowl with a dozen tiny fish and a pair of 1.5-inch goldfish. The seller sent me away with: "Feel free to drop by again. They will die soon but since they are really cheap, you can always stock them again!" His words left a really bad taste in my mouth and it’s true: most of them died within a few days. Instead of visiting that shop again, I decided to do a little research about fish keeping and O lord, I found out that bowl is a fish killing machine! If I was wiser, I should stop right here but I wanted to make it right.

So, it was time for the second round. I went to another shop with a higher reputation and had a nice chat with its owner. He sold me a 7 gallons tank with a small filter, 3x 3-inches Comet goldfish and a dozen tiny fishes. Yes, that many fish, plus what left over from my first batch, the pair of 1.5inch and 3-4 tiny fish. Needless to say, in the new tank the tiny fish and one 1.5-inch goldfish died again. Because of that many dead, I went back to the shop and what he told me was "the weather was really bad in the summer" so I need an air pump and some medical treatment. At that time, I've read somewhere about the 1-inch fish to 1-gallon tank rule and decided to grab another 10 gallons tank for my leftover fish, plus a bigger filter, an air pump and API stress coat. On the way out, I saw his fancy goldfish tank and oh my, the Orandas sure look beautiful! The owner, once again, said that 10 gallons and 7 gallons are big enough so I bought a pair of 4-inches Oranda, a pair of 3.5-inches Fantail AND a Black Moor. Haha, what an idiot I was. This time, none of the fish from the 2nd shop but all goldfish from the 1st shop died. Tired of this, I gave myself a smack and tried to study about goldfish keeping. After a few days of reading, I punched myself again for being a stupid head and decided to start everything from scratch again! All of this happened in around 2 weeks.

For this start over, instead of buying new I searched around and got a sweet deal of this 40 gallons (36x18x16) breeder tank and its base for 25$! It took me 2 hours to clean but at that price, I had no complaints at all! To prepare for the new tank, I bought a Dolphin OWL 1203 canister filter, 6kgs of black sand and put all the old rocks, decorations plus one of the old hanging filters from the 10 gallons tank to do the cycling process. On the other hand, I moved all the small fish (about a dozen leftovers) in the 7 gallons tank and gave them to my uncle, while keeping the 10 gallons tank as the hospital tank. During the first few days, I had to use this tank to house 2 Orandas, the Black Moor, 2 Fantail and 3 Comet goldfish. Since it was really overstocking, I decided to give 2 Orandas away, and after Nitrates started to appear in the 40g tank, I moved the rest there and left 1 in the hospital tank to do Fish-in cycling. Yes, I know it was a cruel decision but these guys already survived a tough environment and I will release them to a pagoda pond soon (I’ve already asked for permission from the keeper, if you want to ask.) So, it's question time


First thing first, for the past few days I used a strip test kit to check my water in both tanks and a Seachem Ammonia Warning in the 40g tank. I've already ordered a Sera liquid test kit but as they were out of stock in my area, I had to order from an online store which will take about 1-2 days to arrive. Because of that, I can't say the water parameters below are accurate. Also, this is the current stock in my tanks: 5 goldfish in the 40g tank which has been cycling for 5 days, and 1 goldfish in the 10g tank which has been running for 2 weeks.

1. I wasn't sure if it was because of the substrate, rocks and media from the old tanks but in a short time of 3-4 days, Nitrate already appeared in my 40g tank (I had poured about 5ml of pure ammonia 10% daily, and moved the group of 5 goldfish there since yesterday.) Today's result was:

- 40g tank

Ammonia 0.05

Nitrite 1

Nitrate 0.5~10

pH 7.6

- 10g tank

Ammonia (no value)

Nitrite 2.5

Nitrate 75

pH 6.8


Once again, I'm not sure if I could trust this result and as soon as the Sera liquid test kit arrives I will perform another test. For now to be safe, I'm doing 25% water change and stress coat daily and from what I can see, all of my current goldfish look healthy enough. However, if the ammonia was still low, should I add more ammonia to reach the value of 1-2ppm to speed up the process or better leave it as it is?

2. Once the cycling in the 40g tank is completed, I plan to stock 2 baby Ranchu, 2 baby Oranda and keep the Black Moor (whom I named Scar, since he survived a really bad case of skin burn and was the first one warmed up to me.) But I am wondering if a 40 gallons breeder tank is big enoughfor 5 goldfish? Should I reduce the number to 3-4 only? As for the hospital tank, should I keep one goldfish there all the time to keep the Nitrogen cycle going or just add pure ammonia?

Thank you for reading such a lengthy post, I really appreciate any advise. Cheer!

 

Welcome to the forum.

If you need to maintain a hospital tank, I advise just running a second filter onto the 40 gallon in the future and just moving onto the 10 gallon when you need to use the tank.

From what I understand - you already have fish in the 40 gallon? If so don't dose any pure ammonia. The fish make enough ammonia to sustain the cycling process, and by adding more, you only help the growth of more bacteria that will die off anyways, since the fish cannot add that extra 1 - 2 ppm.

For a 40 gallon, I would probably keep it at 3 goldfish max. However a more ideal number would just be a pair of them.

 

Yes I have 5 goldfish in the 40g tank for Fish-in cycling right now, and once the process is done, all except the Black Moor will be released into a pond of a pagoda. On the other hand, I would like to thank you for the warm welcome and advice FinalFins! It makes sense, I will stop dosing ammonia and keep monitoring this tank then

For the hospital tank, from what you said I could drain all the water out and keep it dry until the need arise later? It's true that most BB live in the media materials, and not to mention it will lower the chores I had to do weekly.

 

For the hospital tank, from what you said I could drain all the water out and keep it dry until the need arise later? It's true that most BB live in the media materials, and not to mention it will lower the chores I had to do weekly.

Yup - you can keep it dry until you need it. When you do find a time where you fill it up, you can remove a second filter, or a portion of media and install it into the hospital tank. Of course the bacteria won't be 100% capable of sustaining all the ammonia, so you may see some small amounts but in a hospital tank you probably are already be doing water changes as part of the procedure, so the little bits of ammonia will hopefully be negated. It just isn't practical to bring in enough media to cover 100% of all fish waste. There will be some growing in to do as the bacteria settle into a new tank.

 

Welcome to fishlore
Ive been keeping goldfish in large ponds and tanks for years and what ive found works best is 2 fancy goldfish in 40gal very very max would be 3 goldfish.

I would recommend moving the fish to the 'pagoda pond' asap as that will be much bigger space and be more addicquite for the survive chance of the fish, be sure to acclimate espiccally the temperature differences.

best of luck

Keep us updated

Peter

 

Roger that, I'll get 2 fancy goldfish then, with Scar the Black Moor there will be 3 of them in the 40 gallons tank. With close monitoring, I hope they will thrive and live a long life

And thank Peter! Yeah I will release the other goldfish to the pond as soon as the cycle is done.
A little update: the Sera liquid test kit finally arrived today, so I did a few test and what a pleasant surprise - both the cheap strip test kit and Seachem Ammonia Warning are pretty accurate!

It hasn't been a full week of the cycle in the 40g tank, yet today the Nitrate is already goes up to 50 (it was 5~10 yesterday). Isn't this pace too fast? After testing, I did 50% water change to keep a safe environment for my current goldfish and to be frank, I don't think 3 media coarses in the small HOB filter and some rocks from the old tank could be that useful, but the value doesn't lie (The result was the same from both the strip test kit and liquit test kit.) However, I will let the tank cycling for another week and keep checking until both Ammonia and Nitrite drops down close to 0 before putting new goldfish in.

 

Another day has passed, and today result for my tank is:

Ammonia 0.02
Nitrite 1
Nitrate 25
pH 7.6

Nitrite is still quite high so I'm not sure if I could follow the schedule to release the current goldfish and grab new fancy ones this weekend. However, I won't rush and risk stalling (or in the worst case, crash the cycle.) As they said, patience is a virtue. Fingers cross.

Other than testing the water, I drained water on the 10g tank and gave it a good wash, while putting all the used media and gravel to the 40g tank. In addition to that, I bought 3 anubias plants to give my fish something to play with and hope these living plants will help reduce Nitrate in the long run. However, I have another question regarding anubias: As far as I know, they will need light to live and grow. At the moment, I am using this cheap LED light with multi-colors and plan to get a proper light later. From what I read, for goldfish a warmer light (orange-ish) is better than white. Is it true? Can I get away with a decent white LED or spend a bit more and get an adjustable LED light?

Thanks in advance.

 

For anubias, any light will do. For lighting the goldfish, it is just a choice of looks. If you enjoy the look of warmer lights, it will work. But it does not affect the goldfish itself.

Also, I would do a water change to bring the nitrite down. 1 is dangerous for the health of the fish.

 

Thank you for sharing your story with us. We have all made beginner mistakes we regret. I have a goldfish tank as well, they are beautiful fish.

 

Welcome to Fishlore, TungPham ! I appreciate your honesty and motivation to help them thrive.

You're doing great so far. I experience the same - goldfish tanks cycle quickly. Yours seems to be going on great. Make sure you have the supplies you need; since goldfish create a lot of ammonia by themselves, Seachem Prime detoxifies it. You can get a Python siphon to make water changes easy as you simply attach it to faucets. A proper diet's essential especially at the goldfish's young age. As adults, they require plenty of greens and fiber (blanched broccoli, shelled green peas etc.) but at this age they need protein and minerals to aid in proper growth. Look for whole fish, shrimp and worms/larvae in the ingredients list. Fat, ash and fiber should be at 6-8% and protein 45%. As adults they need less fat/protein and more fiber.

Healthy goldfish can grow as much as .5-1"/month! A healthy fantail or black moor can grow as little as 4" and as much as 10" long. Keep this in mind. This tank can become cramped fast.

Overall you're one of my favorite beginners! I just went to my petco nearby and saw 2 people pairs wanting to buy a betta; the young guy/girl couple bought a 1 gallon tank and clearly wouldn't cycle the tank. The second was a mother/son. He said he wants a fish, she says "we're not prepared for that kind of thing yet." Good on her! But folks like you are rare; ones who make a mistake but fix it. You care for your fish and as long as you ask us and/or do the research, they'll thrive.

Good luck pal. I wish the best for y'all

 

Thank you for your words everyone!

I just did a 30% water change earlier and will check if water parameters go down or not, although to be frank, since it's only the middle-stage I think the cycle is going pretty well.

Oh and when changing the water, I've also added the anubias plants - they are tied to rocks and a decorative statue - and wow, living plants make the tank look lively! With how fun the whole process was, I might get addicted to it. (lol)

Here are a few photos, the blurry one is the latest look of my tank, and the others were taken some times ago. Those water piggie are really pretty!

 

Great photograhy!!

Best of luck

 

Quick update: I misread today's test from the strips and thought Nitrite was less than 1, however when I came home earlier my 2 Fantail were oddly energetic, especially one of them kept diving his face into tank's wall. Because of that, I did a Nitrite test and omg, it went up all the way to 5! After seeing the result, I immediately did 50% water change, dosed 5ml Prime and plan to change another half of water in the next few hours.

This Nitrite spike is quite strange, with yesterday result was only around 1 which I changed 30% water in the tank. The only reason I could thought of is the new Anubias plants and 5ml of fertilizer, both were added in the morning after the water change. From now on, I will keep a close watch in Nitrite, test and change water daily to see how it goes, and if it was still high I'll pour another dose of Prime to help my goldfish. In case I was missing anything, please do tell.

P.S: I'm using Sera liquid test kit for Ammonia, Nitrite and Nitrates along with strip test kit.

P.P.S: I'm really an idiot. Two days ago I changed coarse sponge of the canister filter, and when I plugged the power in, I didn't do the manual pump to start the filter. In other words, my tank has been running on a tiny HOB filter (about 10g/h) for 2 days, ouch. With the canister back to action, I hope water parameters will be stablize and go down because changing 50% of water in a 40G tank twice a day isn't fun at all!

 

Another update: after 4 days, Nitrites in my tank finally go down (I did 50-60% water change daily) to 1. After a huge water change today, my result read was around 0.5! I will keep watching for a few more days, and start reading Nitrates too.

On the other hand, all of the group op 6 goldfish were released to the pond. I was a bit concerned about the water in the pond though, as it looks somewhat cloudy and there are A LOT of goldfish and carp live inside (forgot to take a photo of them, as I usually only shot with my camera). But even if the water was somewhat questionable, I believe it should be much better than release them to public pond which a lot of fisher always fishing around, and I hope my ex-goldfish will have a good life in that pagoda's pond.

One more thing, I can't wait to go get a Ranchu and other fancy goldfish to put in the tank! But of course, the tank will be cycling for a few more days until water parameters are stable. Question: in the meantime, with the absence of fish in the tank, should I dose ammonia if it was below 1?

 

You will still have the blackmoor in the tank right? Then you won't need bottled ammonia. If you visit the pond again plz get photos I'd love to see

 

You will still have the blackmoor in the tank right? Then you won't need bottled ammonia. If you visit the pond again plz get photos I'd love to see

I'd planned to keep him, but Scar doesn't go along well with other goldfish. He once bullied a small comet to the point said comet had to hide behind a rock at night time. One more thing I started to notice that he is turning into bronze color--which I know is common for growing black moor--however with each day passing by he looks so different! In the end, I deciced to let him go too. And yeah I'll visit the padoda's pond later, probably next week to check on them.

Back to the question in hand, no, the tank is empty now. After another 60% water change, the current water has:

Ammonia: 0.02 (Result from the Warning Badge. I'll do another test tomorrow, as it doesn't make sense to test right away?)
Nitrite: 0.5 (It's still somewhat higher than 0.5, but definitely not at 1)
Nitrate: N/A as I want Nitrite to become 0 first
pH: 7.2
Temp: 30o Celcius (or 86oF)

 

Perhaps add some bottled ammonia or some fish food, if you do food after a couple hours suck it out of tank it it will rot and go fowl, I don't have much experience with cycling in these methods so I'm not the best person ask.

When the tank finishes cycling what do you plant to stock the tank with? How many fish?

 

Thanks, I still have this big bottle of pure ammonia 10%, which I used only for a few days before the fish was moved from the 10g into the 40g tank (because I couldn't bear seeing them fighting each others in that tiny tank). If needed, I can dose ammonia again without having to rely on fish food.

And once the tank is fully cycled, I plan to have a few small fancy goldfish (5 I think?) but I'll culling them down to 2-3 when they had grow big enough to decide which one I want to keep. The reason is mature fancy cost a lot while I had only to pay around 3-5 bucks for a small, young one. Plus I really want to experience the happiness of seeing them grow up from a tiny to a big fish XD.
(Btw, by "culling", I mean I will probably give the extra away.)

 

Ok sounds good but why go to the hassle of finding the fish another home, losing fish you grew and are attached to when you could keep, grow Care and love for the goldfish all their lives, better off to get 2-3 fancy from beginning and keep for the whole life.

 

Yeah, I'm still considering that too. But as a newbie, at the moment I can't keep myself from staring at all kind of fancy goldfish and choose which type I would love to keep as my long-time partners. With the low price, I think I might as well grab a few and see them grow up and pick my favorite later (from what I've read, those piggie grow really quick!)

And beside, who knows what future will bring, I might want to keep them all and change to a bigger tank--Noooo! Please stop that way of thinking!

 

Best of luck

At least you know and understand the size requirements
Peter

 

Thanks!

Another day, another test. After yesterday's water change, the water inside of my tank are good, or rather, way too clean?

Ammonia: 0.02-0.03
Nitrite: 0.2 (It was just slightly different from 0)
Nitrate: Same, probably 5-6
pH: 7.2
Temp: 84F

I guess I should dose ammonia to 1ppm to keep the cycle going? My new plan is to do fish-less cycling until both Ammonia and Nitrite reach 0, and since there is no fish inside I can cut down water change from daily to the interval of 2-3 days.

There is another question though. Yesterday as I went to check at 2 local breeder shop, I had a small conversation with their owner, but both of them said my "cycle" is too long, and I could get away with 5-7 days since goldfish is hardy. They also said I should change my canister filter, which is rated 265pgh by the producer--but with all the media and coarse, I think it's safely to say half of that number at best. (Note that other than this canister filter, I'm also using a HOB filter which rated for 10gph). From what I've read, 4-5 round of water filtering per hour should be enough for goldfish tank, but they said it should be x10 since goldfish is waste factory. Is it true? I've already spent a lot on this new hobby and would rather stop buying more equipment if possible.

Another note that I took their advice with a bit of salt, as from what I saw, their tanks are way overstock and some fish even have ulcer or itch! Obviously I won't put 10+ fish into a 30-gallon tank like them.

 

I did another test today, and every parameters went up drastically!

Ammonia: 0.5
Nitrite: 5
Nitrate: 40-45
pH: 7.4
Temp: 84F

I found some fish feces leftover in the subtrate, which I believe is one of the factor contributed to this spike as I also dosed 5ml of pure ammonia yesterday. Just to be safe, I siphoned all the visible feces out and did a 30% water change. All that left is waiting for the tank to continue its cycle.

And since I haven't receive an answer yet, I wish to know if I really need 10 times water volume cycling per hour for goldfish tank? All of the breeder I'd met shared the same opinion that my canister filter is too weak. Will an additional canister filter help or I should get a higher grade one? From what I've seen in two weeks, my tank water look really clean even with the 6 small goldfish inside.

Another matter is I am studying about fancy goldfish diet. Since I'm going to raise them from really young age, from various sources I believe I should feed them multi-times a day with little amount each time to avoid over-eating but enough for their growl. I've read that for mature goldfish, high protein food like bloodworm should only be fed once per week, or once every other week, but for young fish they should be fed more, like twice a week to accelerate their growl. Aside from bloodworm, I plan to give them steamed egg with vegetable and homemade gelatin food too. How many protein meal I should provide them weekly? For now I think something like twice per week (bloodworm, egg), with 1 fast day and the rest with gelatin, sinking pellet and shelled peas.

 

I did another test today, and every parameters went up drastically!

Ammonia: 0.5
Nitrite: 5
Nitrate: 40-45
pH: 7.4
Temp: 84F

Lookin' good friend. Remember: you can dose 2-4ppm ammonia since no fish are here to provide it anymore.

I found some fish feces leftover in the subtrate, which I believe is one of the factor contributed to this spike as I also dosed 5ml of pure ammonia yesterday. Just to be safe, I siphoned all the visible feces out and did a 30% water change. All that left is waiting for the tank to continue its cycle.

Feces will only help a cycle. Someone once said (apologies as I don't remember their name) that beneficial bacteria needs other nutrients. In this case fish feces are better than pure ammonia.

I wish to know if I really need 10 times water volume cycling per hour for goldfish tank?

I suggest it, yes. Although you can go up to 20× if you want. 10× is safe since for young goldies. 15-20× is safe for long-bodied breeds as they're more capable of swimming through fast current.

Another matter is I am studying about fancy goldfish diet. -- for mature goldfish, high protein food like bloodworm should only be fed once per week, or once every other week, but for young fish they should be fed more, like twice a week to accelerate their growl. Aside from bloodworm, I plan to give them steamed egg with vegetable and homemade gelatin food too. How many protein meal I should provide them weekly? For now I think something like twice per week (bloodworm, egg), with 1 fast day and the rest with gelatin, sinking pellet and shelled peas.

That's true too. Young goldfish need around 45% protein. Mature goldfish need no more than 30% protein. Fat should be kept low below 8% overall (especially in their daily diet) and fiber should be around 8-10% or so. Of course this varies based on source but I like this percentage. Blanched or steamed veggies are good for goldfish and other herb/omni/detritivores. Steam until soft but not yet falling apart. Mine are obsessed with peas. I had some love lettuce, spinach, kale and others who won't touch leafy greens or my plants. Try a variety of steamed fruits and veg (goldfish really like orange fyi).

High-quality gel food is the best on the fish food market. What brand are you feeding? Or if you're making your own, what are the ingredients?

I make gel food and homemade pellets for all of my rescues - betta food with dried black soldier fly larvae, salmon fillet, river shrimp, earthworm, brine shrimp, cricket powder, paprika, garlic and ginger. My young goldfish food's similar but with added zucchini, peas, spinach, kale, bell pepper and pumpkin (for color/fiber). My favorite thing about homemade fish food is how much variety you can add. Unfortunately I'm a poor, disabled guy who can't afford homemade fish food often but when I can, I do. It's fun and rewarding too

 

5x filtration, even 2.5x filtration from a slow filter on load, is fine. but it's important you don't overstock the tank.

Everything those shop owners were telling you, was from a "make a sale" angle.
-you only need to cycle for 5-7 days
-you need 10x filtration.
-buy 3-6 goldfish and as they grow decide which ones you like the most.

All great advice for a shop owner to give people to make sales. Not great advice for you, the customer.
You don't need 10x filtration, you need 1x filtration, maybe 2x, and NOT overstocking the tank with fish.
You do need to fully cycle the tank, when ammonia and nitrites are gone and just nitrates are appearing, 7 days or 7 weeks, it takes what it takes.

I'd suggest you use the internet, really research the type of goldfish you want to keep, find out what the top quality attributes are, how to select a top specimen, brightness of color, proper finage and body shape, and just get the one or two that you want, even if you pay more for them, than getting cheap fish that might have defects you don't notice until they get older and bigger.

And I'd seriously try to find another shop with better business owners that look out for their livestock and the customer, or a fancy goldfish breeder even that might be local.

I'd rather pay $20 for one goldfish that meets and exceeds all my expectations, then $20 on 4 goldfish that aren't quite what I was looking for and I hope turn out to be what I wanted in a few months.

Better to keep the one fish well that you like, then to keep a bunch of fish you aren't quite happy with poorly,
The shop owners might not like you if you keep a fish for 10 years and come back once a decade to hunt for a single replacement when it dies of old age, but your wallet will like it.

They will have you buying fish, and tanks, and filters and bigger tanks, and bigger filters and more fish, and meds and bigger tanks, and bigger filters if you listen to them.

Just my opinion, 40gallons, hunt down that one fish, the one you just have to have and pay for it whatever it costs. and keep that one fish well in the 40 gallons of water. Add more decoration, more plant if you like, but make the one fish the one you really wanted, and it's worth every penny regardless of the cost, and you don't need a bigger tank, or a bigger filter, or risk too much fish and a heavy waste load and have an easier time to maintain like that.

 

Thank you Jones, even though everyone in this thread said the same thing, but it was your post that helped me made up my mind!

Since I won't overstock my 40g tank, I will use one canister filter and keep monitoring water parameters along the way. And yes, I won't come back to those breeders and will try to find other places. However, from what I've seen, most of local breeders here in Vietnam are usually overstocking with not-so-well-maintained water. They do have some strong filters, but I haven't seen anyone actually care about water paramters like Ammonia, Nitrite and Nitrate, and only one of them actually asked if I check the pH before adding water to the tank. I guess I have to pick the most healthy-looking fish I could find.

About the number of goldfish, actually it wasn't their advise but my own thinking of getting a few young fish to raise. Please don't get me wrong, I love to raise them from the young age and while I don't really expect the "perfect" goldfish, I want to make sure none of them have diseases or deformity. But I'll keep your words in mind when buying and hopefully will not stress these goldfish with overstocking.

And after 2 day, my tank water parameters still haven't go down to 0 yet. Just keep waiting for nature to takes its time I guess:

Ammonia: 0.5
Nitrite: 1~2
Nitrate: 25
pH: 7.2
Temp: 84

P.S: Oh and thank you FistServant, the idea of making home-made meal for them is really good, and the receipt I found on the internet don't look so hard-to-make so I believe I can try them later!

 

P.S: Oh and thank you FistServant, the idea of making home-made meal for them is really good, and the receipt I found on the internet don't look so hard-to-make so I believe I can try them later!

You're welcome friend. If anything else comes to mind, feel free to ask. We're here for you

 

After 27 days, I believe my tank is finally cycled! I've been seeing almost 0 Ammonia and Nitrite (I think Ammonia isn't completely zero yet but very close) and around 40-50 Nitrate for 2 day already.




I will go and grab some fancy goldfish this weekend, probably 2-3 if I could find any that catch my eyes.

Thanks for all the advices folk! You all are really helpful and I am glad that I came here to ask for help

 

if it makes you feel better unless you disrupted the bacteria colony, if the nitrites are zero then it's likely the ammonia is zero also and you aren't seeing the colors right, there's exceptions,when you have ammonia and not nitrite, like beginning of cycling, like disturbing the bacteria colony too soon, or chloramines in the source water breaking into ammonia from the dechlorinator, but that's usually minimal and temporary. but if you had nitrites and running zeros now on that, it's likely the ammonia if it's even present at all, it's negligible.

 

An update: I got 4 goldfish last weekend because well... I like them At first I plan to buy 3, but the 4th one just made her way in.

Let me introduce them, with the photos attached below:
- First is Ram the Ranchu. I really like his shape and how bulky he is, plus his scale is beautiful! Ram is around 3.1inch long.
- The second male is Erik whom I bought from another store, and he is an Oranda long tail. Currently Erik is the biggest fish in the tank, at 4inch long.
- Third one and also my favorite, Himeko the long tail Oranda. She (I can't really tell if it was a female or not since she is still very young) has those gorgeous long tail and pure black eyes, and came from the same store as Ram. She is just around 2inch.
- And the last one, Ginko. I also believe this is a female short tail Oranda. She is about the same size as Himeko and I love the silly way she is swimming. However, after being bullied by Erik in the first day, she is standing quitely in the corner of the tank. I am not really sure what to do with her aside from close monitoring.

That's the whole crew. While Ginko is taking her time to adjust, the rest warmed up to me pretty quickly and those 3 swim up to greet me every time I come close to the tank. I'm looking forward to have a long and great relationship with them

Oh and I did a test this morning, with 0 Ammonia, 0 Nitrite and just a tiny bit of Nitrate.