I bought 2 gsp's at OMG walmart (i know but i couldnt find them anywhere else) Well at first They both had black bellies but one turned white again and he is happy but the other one still has a black belly and has lumps on his belly and tail. I added the parasite medications and I'm putting salt slowly in for them. the PH is 7.8 and i dont have the tests for the nitrate levels or the ammonia levels. But i know they water is good atleast for the other one, so i am lost! Oh and i have them in a 20 gallon tank.