Mmmk next question... Is there a difference in aggressiveness between types of betas?
I've had a few beta in community tanks and in my experience, the crowntail beta (with the shredded fins) is a little more aggressive than the regular beta. The regular one also gets quite a bit bigger. With the fish you have now, everyone has given good advice about watching for the nipping from some of your faster fish. The only other issues i've had come when I add another fish with long flowing fins. Beta kill (or try to kill) any fish that they think MIGHT be another Beta. I think you should do it. It looks awesome in a community tank!