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Hello All, fairly new to the hobby. Just setup my 100 tank. Its been running for 2 months now. I do have a refugium in the middle section of my sump with chaeto and a Tunze fuge light. Since I only have a handfull of fishes in my display, I limit my lights, AI Prime HD, to only an hr or so every day. However, I am running the fuge light several hrs at night everyday. I am starting to see some brown stuff in my refugium, possibly diatoms. My question to the group is, should I add some CUC in there? If so, what kind? I did add some copepods there several weeks ago.