Help please, I've inherited 2 very large about 12-13" long plecos .. have been doing fine . did fight a bout of ich but was able to cure. Current problem is one of the plecos sometimes floats upside on top of tank and i'm afraid he is dying. I've research and have read about fasting and feeding peas tried first time tonite. Any one with any other advice? or tips? I really don't want to lose this beautiful fish. I have 30 gallon tank in addition to plecos i have a pair of catfish and about 4 tropical fish