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zcdh21
03/29/2013, 12:15 PM
I found this small curved thing growing out of one of our rocks recently. Seemed to come in overnight. It doesn't retract at all. Also, my rocks are getting these plants sprouting out of them (last picture). Are the plants or the curved thing bad, good, etc...? Thanks!

meisel1
03/29/2013, 04:25 PM
the white one is padina algae and the green is halimeada both grow quickly so keep an eye. Neither is harmful