identify coral please?

[falonchristie]

I recently purchased a large piece of rock and this was on it. Can anyone tell me if they know what this is. it closes up at night and lays flat after the lights turn on. It feels rubbery and it has just a few tentacles on one side.

 

[cjilge]

looks like a leather of some sort

 

[bob1968]

Looks like a cabbage coral.

 

[chaderic26]

+1 cabbage

 

[Scuba Steve]

+1 cabbage leather

 

[falonchristie]

thank you all for your help