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the Barnacle is feather duster, it's reef safe, if it's limpet can be one which grow too big, or if there is hole on it it can be Keyhole limpet, then most aren't reef safe.Are they safe or should I remove?
then you got it, compare it if you wish from the link thereI haven't noticed it moving but I do notice black tentacles coming out every once in awhile.
this MSGWhat link? And what does sp stand for? Sorry I'm new to the hobby. No fish in the system yet.
It look like a limpet snail, or barnacle (one of both)
this one will die, once taken off it will die, you don't need to remove them, they are filter feeders, just can cover some area sometimes, but I personally do like them (if they aren't too big over 1")Are they harmful? Should I just get rid of it?