I noticed in your signature line that you also have a 40 gallon tank with only a few danios and guppies. Why don't you put your betta in there. There are no fin nippers in that lot. Betta's are fine with almost any non-aggressive fish in my experience.
I thought about adding the Betta to the 40 gallon, but my understanding is that Bettas are aggressive to fish with long fins or colorful fish. Both the Long-Finned Danios and male Guppies have long fins.
I also plan on getting other fish in my 40 gallon. So I would hate to put him in there and then have him harassing the others.