
In my opinion, the Betta would be the one in danger. Bettas like to swim slower, explore alot, fluff their fins, and just like to flaunt their stuff. Their fins are a big attraction to alot of other types of fish. Danios are a spazzy kind of fish, they are happy when in a school size group, too. So, you can overpopulate a tank if you add alot of them. Bettas are a gentle fish overall, just not to other Bettas. If you really want one, please, please,do some reading up on them here in the forum, you will get great info...
