Has anyone suggested keeping African Butterflyfish? I have mine in a 30 but i think a 20 Long would be fine for it. They only grow to about 4 inches and they eat anything that can fit in their mouths, including crickets.
Or you could go with a Leopard Bushfish (Ctenopoma Acutirostre). They are peaceful but will hunt smaller fishes. (same thing. anything that can fit in their mouth.)
I keep both these fishes along with an array of cichlids, but with a 20 gallon i'd avoid cichlids unless you wanted non-aggressive dwarf cichs like apistogramma, bolivian rams, etc.
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