Found this in the sump. Got a bit of LR awhile ago from another reefer and am sure it came from there. Hard to get a good look but are the only pics i could get. Any idea what it is.
There was a thread yesterday that had a link to what it is, but I can't find it. It's nothing bad and they don't get much bigger. I'll look again for the link. If I find it I will post it for you.
I have them also and i think they are just a type of filter feeder. I touched them and they are very hard, and usually growing in darker areas. Nothing but bennificial to your tank
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