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400 gph in your refugium? Doesn't that negate the purpose of a refugium?
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A refugium is by definition a refuge for creatures/organisms which would ordinarliy be preyed up in the main tank, or wouldnt be able to compete w/ faster swimming more aggressive tankmates. An example of this would be Seahorses in a refugium plumbed to an Acro reef, or a harlequin shrimp pair in a refugium connected to a reef. The term has been adopted by aquarists to refer to any smaller aquarium that houses macro algae for the purposes of nutrient export and the pods that make the macro their home. For the purposes of nutrient uptake, yes 400 GPh is less effective on a smaller tank. But Web2000 didnt mention how large his refugium was. If he's running 400 gph thru a 100 gallon tank, thats not too much at all. If he's runnning 400 gph thru a 5 1/2 gallon refugium, thats a bit excessive IMO.
Nick