Unfortunately a male betta I had "rescued" from a luau (he was being used as a center piece with terrible living conditions--who knows how long they had him in the cup before he got to the less than a gallon tank) passed this morning.
I'm nearly positive he was constipated and had swim bladder disease. He was in a hospital tank while I was going to try the whole fast for a day, eat a frozen pea the next trick, but passed before I could treat him.
I hope I gave him the best, last few days before he went. I hope one day people will realize how much care and love bettas need.