Maddi1553 Posted May 5, 2022 Share Posted May 5, 2022 I was wondering if this is the start of coralline algae? Quote Link to comment
seabass Posted May 5, 2022 Share Posted May 5, 2022 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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