do a search for "carnation coral".
btw- you know you have to feed that sun coral in the backround daily right? that requires meaty foods directly on the polyps when the lights go out and they extend. btw- it also gets no benefit from light, so you can put it in a shaded area.
you might be able to train it to open when they lights are still on if you put it in the shade, and put some food in the water column..it will smell the food and should open for you.