something for a 15 gallon???

I don't know much about African Butterfly Fish, but the Cories should be no bother to any kind of shrimp. Shrimp are so light on the bioload that I wouldn't worry too much as long as you keep up with regular water changes. The shrimp will find an equilibrium population in the tank eventually. Ghost Shrimp or Red Cherry Shrimp are nice ones to try.

ara35 said:

what about african dwarf frogs?

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Off the subject of inverts, but anyway... The butterfly would probably eat them, and I don't know how you'd keep it away from the food if you were target feeding Mr.Frog.