I have an 58g Oceanic tank sitting around collecting dust the last few years. I'm wanting to put it to use. I plan on drilling four (4) holes, two for draining to the sump, and two for returns that will be attached to a SCWD on a Mag12. What size bulkheads do I need, will two 1" bulkheads be enough to handle the drain flow? Or should I go with two 1.5" bulkheads?