My axolotl Sprig who's about 2 years old has been having this ongoing problem since January. He's started to refuse food or eats it and throws it all up 30 - 60 minutes later. He's gotten so skinny from it I can see his hip bones. I've been desperately trying to feed him and trying other foods that he would be willing to eat. Originally he would eat pellets and was happy with them until around January when he began to spit them out and refuse to eat them. I've tried salmon, tuna, other kinds of pellets, shrimp (dead and alive), and frozen beef heart. For a little he only ate salmon and he began to poop again and I was hopeful until he spiraled downhill again and refused to eat that. Throughout this mess I tested my water in the tank and at home and realized the nitrates were extremely high even just coming from my home water source. I switched to buying spring water at the store and did water changes often but it didn't help his condition. I then tubbed him and do water changes daily in case it is the water thats the problem. He's been tubbed about a month now and still no improvements. The tank is now dropped down to 20/40 for nitrates and everything else hasn't changed (0 ammonia, 0 nitrate, 7.4/7.6 pH). Even with him tubbed he doesn't eat. He still spits everything out and is extremely skinny. Just today I noticed some of the skin peeling off his toes and I'm devastated. I don't know what to do or what is causing this. Could it be an internal problem? Parasites? He's never been disinterested in food and everywhere I've gotten advice hasn't helped him. He hasn't pooped because he hasn't eaten in so long so I dont know what a vet could do to test if it could be an internal parasite issue. His gills are small and even with daily water changes they haven't changed or grown at all. I'm so upset and need help 