Danios are said to be very nippy fish and it's said that they should not be kept with any fish that have long flowing fins or feelers.
That said, I've never had any problems with my danios nipping any other fish, and I believe that as long as the school of danios is big enough (8+) for them to stay busy chasing themselfs, they'll leave all other fish alone.
Just to be on the save side though, make sure you've got a place to re-house the angel(s ) to.