This is a Bali "Green Slimer" - Acropora yongei. It gets its name from the fact that it slimes heavily when handled, making it tough to glue in place. I got a tiny frag, and 9 months later it was beautifu...l but quickly succumbed to various algae issues and nearly died completely. I pretty much wrote it off, but didn't pull it out of the tank. It started to regrow tissue and then suddenly there were new branchlets about to form. Another five months later (pictured), this coral is 3 times the size it was with five times as many branches, and looked better all the time. It was mounted with Super Glue Gel to a nylon bolt, and never bothered again.