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What is this?
Started a 29G Biocube a little over a week ago. Put in 20lbs live rock + 20lbs live sand and let it sit for a week. 6 days in that star shape appears in the back left corner of the tank. Then it disappears the next day. I thought it was algae that just washed away, but its back. In a different spot against the back of the tank. Any thoughts on what it could be?