I have had two axolotls for about a year and for the past few months they have not been eating and are so skinny I’m surprised they are alive. They get fed frozen bloodworms and frozen shrimp, and they previously ate pellets that the breeder gave me. They live in a 35 gallon tank with no substrate. I have done extensive water testing and the ammonium and nitrate levels are normal. They have a filter that has a low flow rate, I monitor the temperature daily and have a cooler if it gets too hot. I change out their water once a month. I tried feeding them live earthworms to see if that will do the trick but tried and could not eat them, the melanistic one keeps gaping. There has never been anything big enough in the tank for them to get a compaction from. I really don’t know what else could be wrong or what I should do. I’m a college student so it would be a little out of my reach financially to take them to a vet. Please help me try to figure this out since I don’t want to lose them but have no idea where to go from here!!