Anybody know what this is?

Can anybody tell me the specific name of this leather coral? I got it on a whim at Petco a while back and it wasn’t labeled.

Anybody know what this is?

I know about the spirorbid worms (free cleanup crew, far as I’m concerned); I’m asking about the long stringy thing.

Haven’t been on in a while, but here are the first two fish I added about a week ago. Lightning maroon clowns. I’ll upload photos of my new coral frags when I get a minute.

Day eight of the nitrogen cycle. I had a bunch of black plastic around the tank, but I removed it because it was atrocious. Once the tank is cycled, I’ll add copepods and macroalgae. A couple weeks after that, I’ll add the first clowns.

Currently conducting a fishless cycle.