I only feed my adult bettas live food for the most part. I feed melanogaster fruit flies and maggots, grindle worms/white worms, daphnia, mosquito larvae, scuds, termites and then atison's betta pro and hikari betta bio-gold now and then. I have only ever had to deal with constipation in a bettas once or twice and to treat it I just didn't feed for 3 days then fed daphnia and it cleared out.. constipation can be cause from feeding pellets, flakes, freeze dried foods and just over feeding. I always skip a day of feeding a week to help avoid constipation. Plus it gives ur betta a chance to "clear things out" naturally. I have never tried the pea thing but I have heard from many people that it works great but at the same time lots have also said that their betta wouldn't even try it. And yes, oddly enough some people do belive that feeding to rich of live and frozen foods can cause constipation but thats not ture. If a betta gets constipation from live foods it is more likly that it's being way over fed and on it's way to be way to fat lol. But thats just my opionin and I could be wrong. I do for sure belive a diet various live foods is best and I know many people have bettas for years feeding pellets, flakes, etc and never have any issue so really most of this is just what I think :icon_wink Anyhow, good luck with ur little buddy I sure hope he makes it!!