Update:

Did massive water changes for days. Even pulled out all my dirty substrate (sand) without disturbing the tank.

Pleco is nearly dead though.....still extremely buoyant.

Thanks so much for the advice.....I will get on those water changes ASAP. The pleco is about 5 or 6" and the tank is a 77 gallon. The other fish in the tank (one adult angel, 4 harlequin rasboras, 3 scissortail rasboras, 6 neon tetras, and a sailfin pleco) appear to be doing fine...but there is a ...

sorry if this is in the wrong spot, I'm a newbie to this forum! I have a common pleco in my community tank that seems to be having some problems... Basically, it's like he's too buoyant; when he sucks on the glass with his mouth, his tail-end starts to travel up the side of the glass until he's ...