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Hey all, I've been thinking for a while to plumb 2 3 teir racks (1 4footX18X20 and 1 2x1x1.5) into one system. They have been just running with Sponges. I'm planning to have another of each rack into the system in the future. I'm new to sumps and plumbing and have a couple questions. 1.For the return would 1x 32mm bulkhead in each be enough or 2x25mm bukheads in each be enough? 2. The bottom tanks are 200 mm off the ground so they may not be high enough to have enough space to go into the sump especially the 2 foots? Any other tips or better options would be aprecciated. Cheers Will.