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I'm looking to do a reef tank with 2 overflow towers made from 4" PVC pipe and the drain and return in the far ends of the tank and I plan to drill the holes myself, but I want to know what size holes I need to drill for the bulkheads for the overflows, return and drain ?

Hello, I built a BG for my fishtank made of styrofoam, concrete and drylok, I let it cure for about two weeks before I inserted themin my fishtank I used a fish-safe adhesive when I inserted the pieces and now I'm in the process of leaching the tank, I've already done this three times and I want...