I recently purchased a couple of monitpora frags. I know the one on the left is a green montipora capricornis but what is the species genius class of the one on the right?
the one on the right is an encrusting form of montipora (atleast it appears that way in the picture). Montipora is a funny coral, it has the ability to greatly morph according to it's environment. I've seen digitata with growth like that of a capricornis and encrusting that sprouts branches etc. Montipora is one of the hardiest corals able to survive in low light and flow etc but some of them need very intense light to maintain their colors and varying degrees of flow, both of which effects it's growth. The only sure fire way to ID a coral 100% is to either bleach a portion of the skeleton and compare to a book or other archive of some sort, or know it's pedigree before hand.