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 I have tired my overflow box  and sump both were similar  I keep on in the sump whjere water moves to return chamber 
				__________________Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
 Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 3x MP40W, 2X Koralia 4's Wavemaker
 Lighting: 5ft Hamilton Belize Sun (2x250W MH, Blue LEDs) Vertex Calcium Reactor 2x Deltec Pellet Reactors
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