| My Belief is to have a refugium separate and gravity feed back to the tank. That way none of the good stuff goes through the main pump. A refugium should have a slow flow rate. You can use a small powerhead of tee off your main line with a valve to control the flow rate. Then it just overflows back into your tank. You would usually have it on a shelf above the back of the tank this way, feeding back into your tank.
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Dennis
120 gal/tank, custom overflow in center, closed-loop on a Squid, custom sump,Reef Concepts skimmer, CA reactor, Refugium gravity feed into tank, Lighting: 2 - 250 watt MH's, 4- 55 watt PC's, and 110 watt VHO.
12 gal NanoCube, with 2-32 watt PC's and a 13 watt PC, in a custom hood.
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