Couple more questions for you. Did you have to modify the sump at all? I just removed my sk-5000s and went back to filter socks. I have the SK-72 sump and a single Abyzz A200. My sump is also in the basement, but its also across the house about 35' horizontally from the tank. I have been running the Abyzz at 85%. When I have some time, I may try some of the modification to the rollers that you did. Initialy life was good, but as the tank aged, the rollers would not advance enough to keep the water from spilling over the crash box. I surmise that if it did advance quickly enough, I'd go through a roll in about 2 weeks at this point.I'm running the SK72 at about 2700 GPH (powered by twin Abyzz a200's) with zero issues. Clarisea rolls last months. Three things that really help, one, lowering the water level in the fuge section to it's lowest point. Two, using the extended float switch holder in the Clarisea's that should come with the sump (note that my sump did not come with these and I had to contact Synergy Reef to get them). Three, modifying the Clarisea part with the slats in it like this to allow for more flow:
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One thing I cant figure out yet is how you got the water level in the refugium section to be as low as I see in the pic, especially with significantly more flow than I have. I removed the plate covering the holes between the fuge and skimmer sections so that no water goes over the top. However, even with my flow, the water stays 2-3 inches above height of the water in the skimmer section, which I have set at 9 inches. Did you modify the sump as well? I just can't believe you are getting more flow than me through those little holes...
I also see you are not using that fuge chamber as a fuge...so the addition of macro algae is a problem....as it wants to clog the flow through once that is where all the water goes...