I have 2 african dwarf frogs in my 10 gallon with 2 black catfish and 1 male betta, and they don't bother anyting (the guy at my LFS said they would play together, and they don't really do that

they are pretty solitary) However, they WILL eat anything they can fit into their mouth, so if you have any smaller fish, use caution, but the frogs themselves are very small so not really to worry. The only *slight* problem that I have encountered with these frogs is that they tend to get a little aggressive when i drop live worms into the tank (they want them all to themselves, but that is to be expected) I think you should be fine. just keep an eye on them/him/her/it LOL for a few days