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Theoretically it would work fine if you could drill one of the tanks, put in a bulkhead, and get that tank higher than the other tank. I'm planning a fuge separate from my sump and it will be on some 2x4's to elevate the fuge bulkhead above the sump's rim so when water reaches the level of the bulkhead it runs down into the sump's return pump chamber. Basically the same as having a setup with the return pump in the middle, just in 2 containers instead of one.