Hello everyone, so I got this frag recently and it was dipped in coral rx as I always do, what are these brown things on it, they aren't bothered by light or by moving the frag arround but they retract at night. It doesn't look like aptaisia to me but if it is please tell me so I can burn that frag asap. Thanks , and before someone tells me, yes I know my tank is currently overrun by bubble algae, me and my crabs are working on it