I had two dwarf puffers that did fine in my community tank (rainbows, tetras, etc.) but only if I kept them satisfied with bloodworms. If they got hungry they started nipping others. I also at one time had two "leopard" puffers. One was hot and cold and I finally got rid of him when he just got too aggressive and bothered too many other fish. The other one I still have and have had for about 9 months now. Peaceful as can be and never bothers anyone else at all...so they vary....