Maddi1553 Posted May 5 Share Posted May 5 I was wondering if this is the start of coralline algae? Quote Link to comment
seabass Posted May 5 Share Posted May 5 Probably. If you can't brush it off lightly with a toothbrush, then it's almost certainly coralline algae. Otherwise, could be cyano. 1 1 Quote Link to comment
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