I inherited a betta from a co-worker and put him in my 20 gal. long community tank. I was concerned about aggression at first, but he let the buenos aires tetras know who was boss and now all is good. He gets fed the same thing as everyone else in the tank and looks so healthy! I feed a variety of bloodworms, veggie flakes, color flakes, tubifex worms, spirulina pellets, brine shrimp, and am trying to finish up the betta pellets he came with. I think the variety is the key. I have never had a constipation problem with him and I think it's because of the variety and the veggie flakes at least once a week. All my flakes are the Omega One brand.