About 2" or so. I have 2 left here. I had 5 but 3 died. I was messing around in my tank way too much right before I decided to move 3 of them to a new tank and they stressed out way too much and died on me in the bucket  .
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96" x 16" x 16"//106g Skimmerless Reef, Established Jan. 13, 2012
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