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I truly don't have the slightest clue howmake one out of a 20 gallon tank
Yes tank is already set up and running but not drilled for plumpingIs your 40b already set up? Is the tank drilled?
OK you're going to need to purchase an overflow box. Here's the one I have on my 40b https://www.saltwateraquarium.com/pf-300-overflow-box-eshopps/Yes tank is already set up and running but not drilled for plumping

