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thanks i will try that and see how it goes, and i am thinking of a display i guess tank with a few plants and a lot of decorations, with a bunch of medium to large active fish, i am not quite sure though.
The biggest HOB I can think of is under 10 cycles per hour for a 55 so I really dont think this high current thing is an issue unless its all coming out of a little tube... ie a weird filter design..
When I think of fish that like current I think of hillstream (and other) loaches and minnow type fish. I don't think this is a high current tank. You'd need multiple filters or a very large canister, plus powerheads to move the water enough to make hillstream loaches happy.
Here is a pic of the water where hillstream loaches are found, courtesy of loaches.com, and you can see how hard it would be to recreate this in a closed system: