Wits' End - white growth won't leave Neon Tetra Alone

Hi all,
Around 3 weeks ago one of the neons (in a school of 8) started to have a white growth appear on his body. At first, I thought it was columnaris (a few of the others had white growths on their mouths), so I dosed for a total of 8 days Kanaplex and Furan-2 back to back following medication instructions. While this resolved some of the white growths on other neone tetras' mouths, it did not resolve the white growth on the original neon tetra. At this point, I decided it was most likely not columnaris, and decided to order anti-fungal medication (Paraguard). Since the medication would take a week to arrive, and since I did not have the extra heater to make a quarantine tank, I left the neon in my main tank and dosed the tank with stresscoat, melafix, and pimafix to try to boost the immune systems of my other fish to stop infection. No other fish has been displaying symptoms, but the white fuzzy growth on my neon has not been cured either.
The paraguard arrived last week. Since then, I have dosed paraguard into a heated 2.5 gallon quarantine tank as per dosing instructions for 5 days. There have been no visible improvements.

I'm at my wits' end. I've used two different fungal medications, (pimafix, paraguard), and two different antibiotics (furan-2, kanaplex), and nothing has made the growth go away. I'm not sure what to do. Can anyone provide any guidance?

Here are parameters in the main tank. It's a 10 gallon, but I'm using a Marineland Penguin 100B as well as two 4" sponge filters (and loads of hornwort, elodea, anubias) to try to maximize nitrate intake.
As of this week: (0, 0, 20, 7.6, 77 Celsius).
I posted earlier with parameters from both of the past two weeks.

 

Could you post some pictures?

 

The problem might not be Columnaris, but instead, Neon Tetra Disease, NTD.
I don't believe there is a cure fot NTD.

 

Could you post some pictures?

Yea! I've attached a picture. I took others, but they won't upload. I think this one was the best one anyway. I put the neon into a clear plastic container to take some pictures. Here they are:

 

The problem might not be Columnaris, but instead, Neon Tetra Disease, NTD.
I don't believe there is a cure fot NTD.

Possibly, but I don't think so:
1. None of the other neons have been infected, despireme keeping the neon in the main tank for 2 weeks after I noticed symptoms (I dosed the entire tank with kana+furan and then melafix/pimafix).
2. The white blotches are really scattery, and they look like they grew on-top of the neon, instead of loss of coloration of scales in NTD
3. The neon wasn't exhibiting any abnomral behavior besides the growth (no lack of schooling, still eating, swimming normally, not hiding, etc.)

 

Maybe Lymphocystis?

 

Maybe Lymphocystis?

ohno, I agree that's what it is. It seems as if there is no cure, but it is not very lethal. (Exactly what I expected here, I think!) SHould I move the infected fish back into the community tank, or keep it by itself? I'm going to most likely tear down the QT (it's literally a blue bucket), but I may move the affected neon into my ADF tank if hospice care is the best option.

 

Lymphocystis is said to be more or less self limiting; only mildly contagious.
No cure, other than the infected fish's own immune system. Sort of like a fish cold sore.

 

Lymphocystis is said to be more or less self limiting; only mildly contagious.
No cure, other than the infected fish's own immune system. Sort of like a fish cold sore.

Would you suggest reintroduction to the community tank, then? OR to wait and observe for a few more days

 

It will take quite a while before it heals, or if it heals. Things could get worse.
IMO, best to isolate the infected fish.