So I've only had two of these catfish for about 4 or 5 days now and when I first bought them they were extremely active swimming around the tank. Then one of them ate way too much than he should have and got a bulging stomach but him and his friend kept swimming around...mostly straight into the glass. Well his friend got tired of his foolish glass swimming and just started sitting at the bottom of the tank and the other one eventually stopped and kinda fell haphazardly into some plants and didnt move for a while...now the catfish are fighting and arent as active...I also noticed some erractic breathing. Any of this sound normal or is this something I should keep my eye on?