Stocking Issues?

bubblegum-heart

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The tetras, danios and corydoras are all schooling/shoaling fish, they need to be kept in groups of 6+ of the same species. (For example, three neon tetras and three rummy nose tetras probably won't school together. They both need a school of at least six.) What kinds of corydoras do you have? There a lots of different kinds, you can find out which ones you have here. (Found your other post.) I don't know much about your gouramis so I can't comment on those.

I'm not sure if I'm right on this, but to me it looks like you're a little overstocked, but I'm not sure on that. You'd have to ask someone who has more fish-keeping experience.
 
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TexasDomer

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Is this a 20 gal high or a 20 gal long?

In addition to the above points, male dwarf gouramis will fight to the death - they really shouldn't be kept together unless it's a very large tank (4+ ft). I would rehome one of yours as soon as possible.
 

WildEyedDanio

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Looks a little overstocked. For the fish I'd say; corydoras can be kept in groups of 3 without too much trouble, ideally you would want more however I understand the problems of getting an algae eating fish for a 20L. As for danios they definitely need to be kept in schools of 5+ or they will become stressed/aggressive.

I would say either move the danios into another tank and get more or return them (as they're pretty cheap). As mentioned above gouramis males will fight so 1 should be rehomed.

If you do this you could probably get another oto or two
 
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MaddieTaylah

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If this is a 20 gallon long then I would do this as the absolute maximum stocking for your tank:

6 neon tetras
6 zebra danios
6 corydoras
1 dwarf flame gourami

So in recap, you need to up your schools to 6 and rehome the second dwarf flame gourami.

Edit: No longer an option since your tank is a 20 gallon high.
 
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Danjamesdixon

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Aquadvisor should be avoided pretty much indefinitely. ESPECIALLY if you're a beginner. It doesn't take a lot of important factors into account that really need to be accounted for.

There are no hard and fast mathematical rules you can use for stocking a tank. That's why Fishlore exists; we're all here to help each other
 
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brooklynmv

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Is this a 20 gal high or a 20 gal long?

In addition to the above points, male dwarf gouramis will fight to the death - they really shouldn't be kept together unless it's a very large tank (4+ ft). I would rehome one of yours as soon as possible.
The dimensions are 24.1x12.5x19.1 .... And my male gourami's have been doing fine since I've had them. In the store 5 of them were kept in a 10 gallon and doing fine as well. Is it possible for them to just get ticked off one day and then attack?

Looks a little overstocked. For the fish I'd say; corydoras can be kept in groups of 3 without too much trouble, ideally you would want more however I understand the problems of getting an algae eating fish for a 20L. As for danios they definitely need to be kept in schools of 5+ or they will become stressed/aggressive.

I would say either move the danios into another tank and get more or return them (as they're pretty cheap). As mentioned above gouramis males will fight so 1 should be rehomed.

If you do this you could probably get another oto or two
It's a 20 gallon, not 20 liters. So my first priority would be getting more danios and rehoming the gourami?

Aquadvisor should be avoided pretty much indefinitely. ESPECIALLY if you're a beginner. It doesn't take a lot of important factors into account that really need to be accounted for.

There are no hard and fast mathematical rules you can use for stocking a tank. That's why Fishlore exists; we're all here to help each other
What factors does it not take into account?
 
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BottomDweller

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It's a 20 gallon, not 20 liters.
I think they meant a 20 long rather than 20 litres

What factors does it not take into account?
It doesn't take into account the area that fish swim in. For example it says you could have 10 bronze cories in a 20 gallon high and only be 84% stocked. This would be very overcrowded in the bottom area of the tank though you would still have room for upper dwelling fish. Aqadvisor doesn't tell you this kind of thing.

There are many more things it doesn't take into account. Things like activity level, area of tank they occupy, aggression, bioload and many other things all need to be thought about when stocking a tank. Aqadvisor can be used as a guide for experienced fish keepers who have researched the particular fish they want to keep and have a good feel for stocking levels but for beginners aqadvisor is very misleading and can cause them to stock their tank badly.

I've also found that aqadvisor's temperature ranges are a bit weird. It says 19-23c for comet goldfish for example
 
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brooklynmv

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I think they meant a 20 long rather than 20 litres


It doesn't take into account the area that fish swim in. For example it says you could have 10 bronze cories in a 20 gallon high and only be 84% stocked. This would be very overcrowded in the bottom area of the tank though you would still have room for upper dwelling fish. Aqadvisor doesn't tell you this kind of thing.

There are many more things it doesn't take into account. Things like activity level, area of tank they occupy, aggression, bioload and many other things all need to be thought about when stocking a tank. Aqadvisor can be used as a guide for experienced fish keepers who have researched the particular fish they want to keep and have a good feel for stocking levels but for beginners aqadvisor is very misleading and can cause them to stock their tank badly.

I've also found that aqadvisor's temperature ranges are a bit weird. It says 19-23c for comet goldfish for example
Oh okay, I see! Thank you!

So can anyone recommend quick fixes for this stocking?
 

TexasDomer

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I prefer just one schooling species in a 20 gal high due to length. As danios are super active and should be in a 30" tank, I would do this:

8-10x Neons
8x Cories (all one species, but a small species, like panda cories or false julii)
1x DG

What species of cory do you have?
 
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TexasDomer

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Duh, I missed the dimensions. I saw someone mention 20 long and ran with it. Oops! Stocking options changed above.
 

MaddieTaylah

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I did say if the tank was a 20 gallon long, but I wasn't sure if it was. Since it is a 20 gallon high I would say that my above suggestion is no longer an option and that only one school of fish should be in there as mentioned above.
 
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pixelhoot

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Oh gosh! Faux pas there! I completely did not take into account the different levels and temperaments that one might not think of while stocking the tank with just aquadvisor. Yes, I meant the site entirely for bioload, my bad! Secondary research on the specific species is a must, which you have covered it seems. :> I agree with the statements above. A 20 gal high is simply too little wiggle room for more than one school and 1+ danios as danios love to move around which wouldn't mix well with lots of fish to bump into!
 
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brooklynmv

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Oh gosh! Faux pas there! I completely did not take into account the different levels and temperaments that one might not think of while stocking the tank with just aquadvisor. Yes, I meant the site entirely for bioload, my bad! Secondary research on the specific species is a must, which you have covered it seems. :> I agree with the statements above. A 20 gal high is simply too little wiggle room for more than one school and 1+ danios as danios love to move around which wouldn't mix well with lots of fish to bump into!
My neons tend to school on the bottom of the tank while the danios stay in the middle/top area of the tank. I've never seen them cross paths before.. I've already got attachments to all my fish species!!
 
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brooklynmv

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I prefer just one schooling species in a 20 gal high due to length. As danios are super active and should be in a 30" tank, I would do this:

8-10x Neons
8x Cories (all one species, but a small species, like panda cories or false julii)
1x DG

What species of cory do you have?
I believe the cories are Spotted Corydoras, their adult size is 2.5 in average. How big will the DG get to for his adult size? Will he ever outgrow the tank?
 
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