MABJ: it's an Azure Damselfish. I like it, but it's territorial (like all damsels) and won't let my clowns near the reef, or even out of the top back corner of the tank, so he'll either be going into the next tank I do or staying in this one with something bigger than him (if the new tank is bigger than this one and I want to move all the other fish to the new one).
Kelsey: mine is a Favites Brain Coral. An Acan is another type of brain coral (but it's not what I have), and blastos look quite different than mine does. It isn't an Open Brain Coral, which I think may be what most people think of when they hear brain coral.