This came in on my live rock from KP Aquatics about 2 months ago. Honestly thought it would probably die off, but now it’s growing a new piece on the other side. Probably about 4 different pieces of this around the whole rock. No idea what it is.
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I think you are rightLooks like a calcareous algae like halimeda.
yea its pretty cool was hoping it wasn't invasive or harmful. Good to know. Just let it be thenHalimeda species.
Not a tastey macro for tangs, but a lovely macro to have in your display or fuge.
No worries, a good hitch hiker.