Ok, here is the deal. I want to drill a 1" and a 3/4" bulkhead into a 55g acrylic tank that is FW now and plumb it into my 75 gallon reef. Thing is, I want the 55g next to the 75g. I already have an 18g sump and an 18g. refugeum fed by my lifereef overflow box under my 75.
Here is what I am...