I went for just the one and hope it will start multiplying before too long (Matt gets one of the offspring when it does). At the moment, the tank's in a bit of a transition stage, making it difficult to find exactly the right position for it. Well, it's looking fine at the moment (lovely color in the tank), but I don't expect it to start multiplying too quickly.
Am I right in assuming that blue coral = less light? I know that kind of follows for some of my blue zoas, but does it also apply for Discoma?