At full blast these things have a definite "rumble" so you might not be happy with it running flat out. I have one on a 55 tank and I crank it up a few times/week for several minutes to clean the system. Having said that, you know how porous the rock is, and I still use a turkey baster once/week or so to blast water directly at the rock. It is amazing how much powdery debris "smokes" out of the smallest holes. I think much of that might actually be micro detritus from the 'pods and worms but this is just a theory.