I have a frag tank that is 3x2' and 8" deep. Will be using probably a 20 gallon sump and I will probably have about 3' of head. I will be growing only zoas in this frag tank so how many gph return pump would be good for me?
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There are so many things to consider in making this decision. What is the capacity of your overflow? Are you going to use the return pump as a main part of your in-tank flow?