i just got into this whole saltwater thing a few months ago, but i am becoming obsessed with it especially with corals. I have 4 mushrooms and some white star polyps. So i woke up this morning and it looked like a spider webb coming off one of my chunks of live rock(8lb chunk). I read that some corals have defense mechanisms and also weapons used on other corals that look like this stuff i'm talking about, but i have no other corals. I look further and this rock is covered in this stuff and has trapped lots of sand particles(looks just like a cob web). I look closer and i see little white branches developing on this rock amost like a stoney coral, but it can't be because my lighting isn't THAT good yet and i have no stoney corals. WHAT"S UP!!!! Does anyone know what this stuff or the growing white branchy stuff is? Could i have gotten a hitchhiker on some shrooms or live rock i bought a few months ago and it just didn't show till now???