Ok guys I have a fish tank (29 gallon) that has had the same inhabitants for over a year now. These inhabitants are two common angelfish, one B. Rainbow, and one Plec. I made the decision to leave them in the care of my girlfriend while I work this summer to avoid having to transport them 5hrs from Fayetteville, AR to Memphis, TN. Anyways, one of the angelfish is now having "trouble breathing" and is laying sideways at the bottom of the tank. He doesn't seem able to eat or move much either. My GF immediately changed the tank water and his condition seems to have improved only slightly (he moves around a little). Btw the other angelfish seems pretty healthy, which is why I am confused because it seems that if tank conditions were unfavorable then all the fish, or atleast all the fish of the same species would be suffering, not just one. Any help would be greatly appreciated. Thanks for all your time guys!!!
-Trip M.
-Trip M.