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40g breeder overflow box

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Your sump size is a piece of the puzzle as you don't want too much flow through there or you may get bubble problems.  Are you planning on running anything else off your return pump like reactors?  Lastly will you use powerheads in the tank for flow, so the return is purely for filtration?  Not knowing the answers to the below, I am guessing you will need something that delivers around 400 to 500 GPH after head loss.

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