Low light to help with algae.
Try a spray of peroxide on a place you can sacrifice when it needs cleaning.
PITA to work on a tank like this,
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250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps.
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