my 90 gallon cant be drilled on the bottom i built an over flow box hand the tank drill 2 inch for the top of the tank on the back used a 1 1/2 bulk head ran pvc pipe to my sump i did not drill the return lines i hung it over the back , i allso blk out the back of the tank with oil based black paint from home depot it drys like rubber easy to remove and holds up any ? shoot me a pm our post it here
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