Not stupid at all. No such thing.
Powerheads, filter pumps, external pumps, wavemakers....
anyone else?
Just be sure to check and research what the creatures like, whether the like minimal flow, moderate, or high.
They can prduce differnt flows it depends on what they are rated at...and i do believe some of them are adjustable so you can control the flow rate even further...hth
~Rocco~