Bettas all have different personalities, so one might do fine with ADFs and others might not. Mine is a maniac and immediately tried to kill both ADFs in the tank - I had to separate him. My frogs did fine with some cories, some otos, and some bloodfin tetras. Now they are only with otos for algae, but only because I got a larger tank for the fish.
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Torey
Salem, Oregon, USA
1.1 Uromastyx Geyri (Joe and Arthur)
2.0.1 Uromastyx Dispar Maliensis (Tank, Turtle, and new neighbor Spike)
1.2 Anolis Carolinensis (Bowser, Leeloo, and Sprocket)
1.1.1 African Dwarf Frogs (Bruce and Sheila)
1.0 Betta Splendens (Mr. Miagi)
1.1 Felis Domesticus (Roscolux and Jenny)