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					Originally Posted by  justinl
					 
				 
				Is it the only mechanical filtration in your tank?  no canister or HOB filters?  If it's the only thing keeping water clean (excluding bio filtration) I would leave it on.  No proof that you need it on all the time, just seems like the right thing to do.  Plus it'd be a hassle to unplug and plug it in all the time.  If you have a canister or something then I would say yeah sure, why not. 
			
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 Got a canister as my return pump, so the water gets scrubbed before it goes back into the tank.  I also have some chaeto in the sump... I have the RK2 so it wouldn't be an issue to program it to turn on/off whenever i wanted it... Although i have played around with it a bit and its a little quieter now... perhaps i'lljust have to experiment with it.