Hi. The male Betas are outrageously handsome. Ollyco08 is right! They really don't play well with others. They do like to blow bubble nests and they won't feel threatened if you have them in a very docile tank. Hopefully are are aware that they are fin nibblers. They will snip at other long finned fish. They are also a lot of ego. When they "clown," they are feeling hostile and threatened. I'm sorry he's not participating w/your other fish. You may try having a place he can hide for a moment or two as he becomes more familiar w/ your other fish. Please do NOT put 2 males into the same tank. It's sad and inhumane when they fight and chew each other to pieces. Other than that, I really enjoyed them and I hope you do too! Take Care!