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The only true top dwellers that are readily available around here are butterflyfish and hatchetfish. The butterflyfish mayl eat/attack small fish that enter it's territory so it's not really suited to the average community tank. Hatchetfish do best with little current.
Personally I love my rainbowfish. What size is your tank? The rainbowfish are beautiful and mine school at the mid-top level.
I have a 20 gallon high With a power head creating a top current the length of the tank (from corner to opposite corner)
2 Bolivian Rams
3 Corys
3 Ghost Shrimp
(what is the best stratagy for feeding the shrimp)
10" of fish
The tank is about 2-3 months old.