I have a couple axolotls that keep getting fungal infections. Each time they get one, I salt bath and keep them off system until they recover. I also test the water chemistry and it has never been outside of ideal values. The system also has a chiller which keeps the water at 18ºC all the time so the water is never too warm. The system does have a bit of an algae problem but from what I understand algae isn't harmful to them. I usually have them back on system for three weeks to a month and a half before the fungal infection comes back. They don't show signs of stress like curled gills/tail and never lose their appetites. I have 9 axolotls and this is only a problem with two of them. None of the others have ever gotten an infection as long as I've had them. Is there something I might be missing when it comes to keeping fungus at bay?