Tubastrea are cool, I had one in my last tank for a long time, I just turkey basted frozen brine at it and kept it in a darker spot of the tank. I saw a couple small ones at exotic tropicals today, I may have to go back and pick one up.
Have you seen the picture of the Tubastrea dominated reef tank that is in the reef aquarium volume III ? its on page 575 literally hundreds of polyps, pretty sweet!