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Looking more closely at your sump I have the next size bigger (R-200 3 gen) but should work the same. The rear section (box 4) is small and hard to get to. I would only have in there the return pump and the ATO sensor or float. I have my reactors feed from the skimmer section & return into...
I have the R-200 for my 65 gallon tank and works very good using the Triton Method. Only issue is the rear return area which is hard to get to, small and limits the size of the return pump.
Been to Ocean Image Aquatics today and hung out for an hour or so. Alex is very friendly and more than willing to talk about fish and corals. He got a new shipment of fish today.