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					Originally Posted by The Grizz  Biggest problem is not enough flow and no surface skimming due to the fact you are using a canister filter. With canisters you will not have the surface skim that is required of a SW system. | 
	
 +1.  
I had that issue with a 20g I ran.  I added a small AC with surface skimmer attachment.   Worked like a charm.