These came on some live rock I bought the other day. Does anyone know what they are? They're not looking very good and I was wondering if I should try to remove them from the tank or just let them die off.
Difficult to tell but I would guess dying cloves or xenia. It's a pretty good guess whatever it is (or was) is fairly invasive, so I would scrape them off, don't let the pieces fall into the cracks or it may regrow.
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