Little 2.71 has been sick for about two weeks. First he got fin rot, so I moved him from his 5 gal to a 2.5 gal so I could do water changes every couple days. I put aquarium salt in his tank. I can't really tell if he is getting better or not. He is still missing some of his tail. Then shortly after that he started breathing heavily, not rapid, but I can see him breathing from the other side of the room and I never could before.
He hardly moves at all, he sits at the top of the tank with his mouth just below the surface. He is taking big gulps of air. He has only been eating about 1 pellet of food every two days.
I don't know what to do for him.