If your Ammonia and Nitrites are at 0 then you should be good to go with a CUC.
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80g Deep Blue Rimless - http://www.reefcentral.com/forums/showthread.php?t=2651295
225g Reef Savvy SPS Dominant - Retired http://www.reefcentral.com/forums/showthread.php?t=1945361
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