just as a follow up ,,, got a second colt coral which has become a center piece to my tank,, it goes into that dormant, scrinking state fro several days and then blossoms, they are territorial and will defend or attack to maintain and or grow larger , following is an article that might help tounderstand what they do:
AquariumFish.com :: Aquarium Fish International :: The monthly magazine for both novice and expert aquarium hobbyists.
i've got 14 different corals in my 90 g , i feed them ocean blend once a day and iodine twice a week and they all seem happy i also feed them coral planckton or other food three times aweek.....
enjoy