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Building a 40 gallon sump
So I'm gonna build a 40 gallon breeder for a sump. My questions are 1 how do I calculate what the rerun pump needs to be for GPH I have a 65 gallon aquarium that is 48 L x 13 w x 24 H, I would like to run a return line that tees off in two two return outlets! 2 I will have to run an job overflow how do I calculate what GPH that needs to be? Thanks in advance for any help

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