What kind of fish if any can you combine with a beta couple in a 10 gallon tank?

My understanding from my aquarium days was that most of the standard tropical fish were acceptable with a Beta. I think I've heard that they might want to nibble at the fins of an Angelfish. The big no-no of course is a second male Beta.

Good fish for a 10 gallon with a betta are Cory catfish (be sure to get the pygmy variety or else you are in for a surprise) cherry barbs, and depending on your bettas personality neon tetras. some betts can get along with neon tetras, others don't. All of the above mentioned fish need to be in groups of 6 or more because they are highly social fish, and will become the fish version of insane if they don't have alot of their own species around them. what do you mean by "betta couple?" male bettas should NEVER be kept together in the same tank unless it is divided, and females should NEVER live in groups of less than 4 (in a ten gallon you could do 6 females if it is heavily plated and decorated, but you shouldn't add other fish).