Help! Please I can’t do this again!

Tank
What is the water volume of the tank? 10gal
How long has the tank been running? 2 months (but was started in a 2.5 gal tank that was added into the ten water substrate filters and all and then slowly added to and taken away from to get it fully switched and monitored closely for any cycles or micro cycles even.)
Does it have a filter? A HOB penguin, a two sponge air ran, and a small HIT filter that I use when I know the tank is going to get stirred up, so I put it in for a bit in advance and for a little while after (couple days+)
Does it have a heater? Yes
What is the water temperature? 78 (was raised due to possible ick but then I brought down because I don’t think it’s ick)
What is the entire stocking of this tank? (Please list all fish and inverts.) 6 guppy-endlers 2 Glo danio 1 Glo tetra 1 swordtail many MTS (the one shrimp and newly born babies were taken out of the tank so I can treat the rest without worrying about them)

Maintenance
How often do you change the water? Weekly or every other if something comes up.
How much of the water do you change? 20%
What do you use to treat your water? Prime
Do you vacuum the substrate or just the water? Vacuum occasionally

*Parameters - Very Important
Did you cycle your tank before adding fish?yes
What do you use to test the water? API Master test
What are your parameters? We need to know the exact numbers, not just “fine” or “safe”.

Ammonia:0
Nitrite:0
Nitrate: High (have been fighting this problem for awhile with water changes and vacuuming and even trying RO water remineralized)
pH:7.8
(These readings were from before the water change and vacuuming of today)

Feeding
How often do you feed your fish?once a day
How much do you feed your fish?half a pinch of flakes
What brand of food do you feed your fish?omega
Do you feed frozen or freeze-dried foods?not currently

Illness & Symptoms
How long have you had this fish? Born in my tank 6 month ago
How long ago did you first notice these symptoms? Two weeks
In a few words, can you explain the symptoms? A white spot on head that looked almost like loose scale but then became more like white fuzzy growth
Have you started any treatment for the illness? Applied gently with Q-tip watered down quICK brand treatment and added stress guard into water
Was your fish physically ill or injured upon purchase? Born in tank and was always healthy along with her 3 sisters however all the other fish that have been transferred out of my 30gal and into this tank till I can clean and restart the 30 we’re the survivors of an unknown plague that claimed a lot of fish and eventually left me taking no about half my stock to a pet store to be hopefully rehabilitated as I couldn’t stand to lose any more and nothing was helping. The surviving fish all were fine for months and seemed to transition fine not the ten gallon except two of the fish soon showed signs of stress tho no outward illness. The swordtail seemed lonely and despondent in the 30 gal and became more so in the 10 (we were hoping to get more swordtails soon so he didn’t suffer from not having a school but now this illness means we can’t. He lays on the bottom a lot but can swim when he feels like it just fine and his breathing is somewhat fast. Also one of the Glo danios, and the oldest and meanest fish (a good year and a half old) seems to breath fast but otherwise seems unaffected.
How has its behavior and appearance changed, if at all? The only sign of anything wrong before the spot showed up was that she seemed to often swish her tail and move her fins very fast like a hummingbird but did not act any different than her sisters. She may or may not be pregnant because at least one of the guppies had fry just today and there are two males, albeit small and possibly growth stunted from all the medication given in the 30gal tank where they grew up in, so we weren’t even sure if they’d be viable studs but apparently at least one is!


Explain your emergency situation in detail. Not much else to explain however I have pictures from when it was first noticed and from today when it was a fuzzy growth but the netting seemed to have scraped or flattened it down from how it first looked.
Earlier:





Today:

 

First of your overstocked for a 10 gallon and that is what's causing all your troubles. You can rehome the fish not suitable for a 10 gallon or upgrade to a bigger tank.

 

First of your overstocked for a 10 gallon and that is what's causing all your troubles. You can rehome the fish not suitable for a 10 gallon or upgrade to a bigger tank.

Agree to disagree on this point also it’s only temporary while I get my 30gal running so it’s also necessary for the moment and my only option. I don't have another tank besides the one I need to overhaul that I lost most of my fish in and even if I did it wouldn't be cycled. Also even if overcrowding IS an issue it is not the cause of the disease that this poor guppy is suffering from as it wiped out half a tank by either death or having to regime them back to a lfs so they could have a better chance than I.


Not so full.and yes, I know bioload is different than how full a tank looks, but there have been much worse overcrowding done where all the fish are healthy so I'd really appreciate if the focus stays on the one sick fish.

How she is looking today:

 

How she is looking today:
View attachment 634811View attachment 634812

I would try using jungle brand fungus tablets that's what I use for my fish if they have and spots like that and it has always worked. I usually get it at walmart in the fish section. I just recently had a guppy with a spot on its side last week and it fixed it.

 

Its hard for me to tell from the photos, but a fungus infection will look like a tuft of cotton ball, with fungus strands growing out of it. Similar to what you would see grow on a piece of fish food that is left in the tank.

Bacterial infections can appear "fuzzy", but they don't grow any tufts from them. From what I can see in the pics, it looks more bacterial to me.

 

Agree to disagree on this point also it’s only temporary while I get my 30gal running so it’s also necessary for the moment and my only option. I don't have another tank besides the one I need to overhaul that I lost most of my fish in and even if I did it wouldn't be cycled. Also even if overcrowding IS an issue it is not the cause of the disease that this poor guppy is suffering from as it wiped out half a tank by either death or having to regime them back to a lfs so they could have a better chance than I.
View attachment 634805
Not so full.and yes, I know bioload is different than how full a tank looks, but there have been much worse overcrowding done where all the fish are healthy so I'd really appreciate if the focus stays on the one sick fish.

The main cause of bacterial or fungal infection in fish is dirty water. Dirty water is caused by one if 2 things, overstocking or poor maintenance. If you can't or won't rehome or upgrade up your water changes, id probably be doing at least 50% every couple of days. You said you nitrates are high what's the reading on the test kit.

 

I would try using jungle brand fungus tablets that's what I use for my fish if they have and spots like that and it has always worked. I usually get it at walmart in the fish section. I just recently had a guppy with a spot on its side last week and it fixed it.

Thanks I'll give that a try!

 

Today: dosing with the fugal tab today because there was more babies born so had to postpone adding it for a day. Does it look more fungal or bacterial? There's now a tiny patch on her dorsal fin. Since I'm going to treat whole tank and let her out of the breeder so she can get more of the med or should I leave her in to try not to spread it better (does touching spread it more or faster?) And add part of the tab directly into the isolation tank. Water does flow throughout it and I even made sure that there's a special piece of hose transferring water from the outflow of the filter and into the isolation tank.

 

Today: dosing with the fugal tab today because there was more babies born so had to postpone adding it for a day. Does it look more fungal or bacterial? There's now a tiny patch on her dorsal fin. Since I'm going to treat whole tank and let her out of the breeder so she can get more of the med or should I leave her in to try not to spread it better (does touching spread it more or faster?) And add part of the tab directly into the isolation tank. Water does flow throughout it and I even made sure that there's a special piece of hose transferring water from the outflow of the filter and into the isolation tank.

View attachment 635594

Any update on the guppy

 

Updated photos today. The tablet doesn't seem to be helping. Did an hour bath using paraguard (according to label) and a tiny amount of aquarium salt. Not in high temp. Starting to suspect it is not fungal in nature. Is swimming fine but still fast fin moving most of the time.
Pics:

 

Anyone have recommendation for a bacterial infection?

Its hard for me to tell from the photos, but a fungus infection will look like a tuft of cotton ball, with fungus strands growing out of it. Similar to what you would see grow on a piece of fish food that is left in the tank.

Bacterial infections can appear "fuzzy", but they don't grow any tufts from them. From what I can see in the pics, it looks more bacterial to me.

What would you treat a bacterial infection with?

Any update on the guppy

Still showing signs and even worse. I’m pretty sure at this point it’s more bacterial than fungal, luckily it hasn’t spread and the large tank is slowly getting cleaner and should be ready for fish habitation by next weekend if I can get enough RO water transfers done and get the rocks cleaned and reput into the tank. Hopefully the nitrates will be down and the ph back to normal. Then I can move all the other fish back in and just leave the sick one to be treated in the current tank.

 

She seems to be doing better, heavy emphasis on seems so while I'm happy I'm trying not to get lulled into to much of a false hope, just in case. I think the bath and paraguard really helped so I'm going to give her another one today and hopefully see even more recovery. If anyone has any suggestions or has seen anything like this and know what it might be please do let me know. Thanks for all the ideas and to all those that cared enough to comment and help.

 

She looks the same as the last pics but is still spending an unusual amount of time laying on the bottom or the sponge filter. Still just using paraguard and watching. Sadly one of my healthy guppies died during fry birth I think because she had a second clutch of eggs still inside that weren't nearly ready to be born (found during autopsy done to check for non microscopic parasites like worms) so it makes me think it may be bacterial even more :/.

 

The location and what the lesion looked like after developing makes me think columnaris/saddle back disease.
If you have a spare heater, grab a bucket and use it as a QT, do daily water changes. If it is bacterial then it is contagious, the longer you leave the fish in the tank, the greater the risk that the other fish will get infected.

How high are your nitrates? You state 'high' but haven't quoted a number. I don't know what high means to you.