Originally posted by baytran7
...but just has a bulge in his belly (not big)...
Doesn't swelling usually indicate injury or infection? I'd vote for QT and a round of antibiotics to be safe. If it's injury, the antibiotics can reduce the oppurtunistic diseases, if infection it should help him get better.
Peas couldn't hurt though. I tried them on freshwater fish before, and it does the trick. Might not be nutritionally balanced for a sea critter, but as a treatment you can always give it a shot. I'd imagine most whole, live macroalgaes would have a similar effect on the gut as peas. What is his normal diet?