Illness/Sickness: Someone please help my Niobe

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She is a juvie around 7/8 months old. She's been in a 20g long with two other juvies her size while the new 55g is setting up. I noticed she started losing some gills and coloring, so I transferred her to a tub of fresh water, where I've been changing it out daily to no avail. She's becoming skinnier, grey, refuses to eat. Her gills are nowhere near how beautiful they used to be. I'm heartbroken. Her tankmates Casper and Apollo are in perfect health. She will take a pellet a day (lexolotls) and was eating red wigglers last week. Temperature is fine, could be cooler though. Here is a link to what she looks like as of today, and if you scroll though my photos, you can see how pretty she used to be.

https://www.instagram.com/p/BNw104gBjPf/

 

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This was her.

https://www.instagram.com/p/BMWhYcNBjBp/

 

[AxolotlChris]

Certainly needs freding a lot more, the Axolotl is skinny in both pictures. Get a thermometer to check your temps properly. What's the test results for Ammonia, Nitrite, and Nitrate?

 

[snowbutton]

The second pic was when i first got her so of course she was skinny....

 

[snowbutton]

brb ill test