One of my bettas has had what I think is constipation for almost two months. Its stomach is a lot larger than my other betta's, and he doesn't look too healthy. I started feeding him green flakes instead of the betta bites cause they are more easily digested. I've added some aquarium salt. What else do you suppose i do? Oh, and i've also tried feeding him peas many times, but it doesn't seem to change anything. I let him fast a few days a week to see if that'll clean his system, but that hasn't helped either.