What is this?

[ebbdiver]

Hi all,
I'm new to diving, so I'm trying to learn what I'm seeing. I took this picture near the Great Wall at Little Cayman. Was wondering what the green bumpy mass is (coral?) and also the dark shiny circular objects attached to the green mass at the bottom are.
This was a fantastic dive, took 400 pictures! Thanks.

 

[ScottyK]

The green stuff is not in sharp enough focus to tell. The black circles look like a type of soft coral know as a Mushroom Polp, but I can't get a handle on my depth perception from the photo.