I found when I was using h2 ocean and instant ocean I had the brown scum form on my water change tanks. Using reefers best I don't see to get it any more but I changed tub shapes and cover them to keep the light out entirely now so might play a part as well
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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