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- Sep 7, 2019
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Hi, I am planning a 120 gallon, 48x24x24 reef tank, it is made of acrylic will be using an external overflow with 3 drains (plumbed as a bean animal). What size drain pipe would you use? 1.5"? And for the return? 1"? I am trying to wrap my head around ratings for gravity fed flow through pipes, but maybe I am not doing a great job at it..