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My main tank is a 75, going to be using a Lifereef overflow, so that's gonna give me 600 gph to a 20L sump. Now the reason why I was considering using 3/4" on my return was for the SCWD, trying to maximize flow in the tank. I have 2 Koralia 2's in there right now just keeping it moving while I wait on the rest of my supplies (poor live rock is sitting in a rubbermaid for another day or 2). Figure can get 2 return pipes alternating so I can get some corals going one of these days.
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