Hello, is this a sponge? It's white growing on my rock. I was able to break a small chunk of it off with my turkey baster and smash it. It feels spongey? It has no smell and did not crumble. Can anyone help me figure out what it is? It's growing on the bottom side of my colony of zoas, idk if I should remove it entirely or let it be? Seems like it may suffocate my zoas.
Thanks in advance!
Thanks in advance!