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- Sep 11, 2019
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Hello, I set up a 125 that had dual corner overflows pre drilled at 1" so I just went from there. I am helping a friend put a 90 gallon reef together. They originally thought they were doing a 75 but got a good deal on a 90. They had already purchased a modular marine overflow with bean animal style drains that is rated for 800 gph and has 1/2 inch drains. The sump has 1 inch drain connections. Should a larger overflow be purchased for this size tank? The other options are 1200gph with 3/4 drains or 1600gph with 1" drains. The 800 overflow box is 8 inches in length, the 1200 is 12 , the 1600 is 16. I had this all planned in my head then the 1/2 inch drain size threw me off. What would be the optimal set up for this? Thanks