only about 1-1.5" in DT but there is 4" in refugium. There is lots of circulation. 2X tunze 6055 turned right up, and the 350gph return and about 100gph return from the refuigium The tank is only 50g 
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Marty
50g reef, bubble king skimmer,20g sump,zeovit system, PM cal reactor
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