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The problem with a bulging stomach is it could mean so many different things: swim bladder issue, internal infection (edema), internal parasite (Hexamita), renal failure, a tumor growth or just simply constipation. 
Have you noticed any white stringy poop? Is the fish still eating? If so, you could try feeding a peeled boiled pea.

Have you noticed any white stringy poop? Is the fish still eating? If so, you could try feeding a peeled boiled pea.
If they have flukes, the presence of praziquantel is causing the flukes to spasm all over their body (and inside their gills/eyes) before dropping off. Yeah, I wouldn't be hungry or acting right either. 

