Chucks addiction has a great write up on seagrass beds as well as other zones. In the seagrass one he has a picture of one of the corals you describe that rolls and has living tissue all the way around. http://www.chucksaddiction.com/zone1.html
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-David-
President - New Hampshire Reef Club
There’ll be no one to save, with the world in a grave
Current Tank Info: 100 gal lagoon/seagrass, 100 gal sump, Lifereef 72" skimmer, 180 inwall, 125 inwall seagrass/lagoon in progress
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