Green with Blue Rim Montipora sp.
This Montipora is the scrolling variety, and the leading edge where growth occurs is light blue, a nice contrast against the green. Lighter green polyps dot the surface, and feed from the water column. Scroll or plating corals are popular in SPS reefs, but are usally best placed lower in the tank because the shadow they cast will shade any other corals beneath. Without light, those corals would likely suffer or die. "Caps" or "Monti caps" are considered easy beginner corals.