i have a tiny powerhead on my 60 gallon with my tiny pbass.. it's one i got free in a tank deal, so i really don't know how much water it is moving, i set it up on top of a ATI Hydro 5 foam filter so it adds more filtration to the tank too. the little Pbass love it, they do exercises in the flow and then go and rest in the hiding spots in the driftwood.. kinda fun to watch.