cobwebs

[Snausy]

In some places on my live rock there looks to be cobwebs...something just like it. Thick spiderweb type stuff. Doesn't grow all over just stays in a couple spots.

Any idea what this is?

[MalHavoc]

yeap. vermatid gastropods. A type of snail. Perfectly harmless. They live in small tubes attached to your rock.