I have a common pleco, about 5inches long, that has gotten very bloated the last few days, floats to the top and has trouble swimming to the bottom of my 90 gal. community aquarium. Belly of the fish is very bloated and he also floats upside down. He was moved from a 20 gallon community tank recently where feeding and water changes are somewhat erratic. First week here had no problems and if anything seemed more active and better colored. symptoms started about 2 weeks afete the move and about 5 days ago. The fish has good color, reacts vigourously when touched. Water parameters are fine, all other fish-tetras, platies, danios, corys and otos are healthy. Fish are fed a variety of flake and freeze dried bloodworms and tubliflex, plus algae wafers. Help-, the pleco looks like it could pop!