Curious what are these?

[HaZRaTTy]

Originally Posted by reefwars

its a sponge that grows on zoanthids i have all kinds of it in my grow out system , if left alone it will smother the zoas and kill them , besides that they are harmless and photosynthetic.

overtime it can weld liverock together(found this out the hard way lol)

Well guess I know who I got it from Kidding.

Okay well how do I rid it...Denny or do you just leave it, I think its sort of sweet looking. but one frag I can deal with if its hits them all i'll pull my hair out.