This bubble coral was over 10 yrs. old when I lost it to a rogue urchin and infection.
I could barely get the base in two hands. It would easily fit into the palm of your hand when purchased.
Here is my experience,
1. They can grow very large. This one was over 1 1/2 sq. ft. when open and much more with its sweepers out. However it never bothered any corals in my tanks.
2. They like to eat. I have fed mine everything from silversides to flakes to frozen foods. Usually frozen mysis shrimp was its main course, when I fed it direct, which was not that often. It grabbed stuff from the water, as I usually fed pretty heavy.
3. Did not like very much current, just enough to move the bubbles but not distort them.
4. I had it both on the sandbed & in the rocks. It seemed to prefer the rocks or even a 4 in. pvc coupling base I had it sitting in, from another tank.
5. Always did best when placed at a bit of an angle. This pic shows it pretty well straight up, but it was low down in a 30in. deep tank, protected by rock walls on both sides.
6. Contrary to popular belief, mine loved the light. In my old tank back in Thompson, it recieved direct morning sunlight and did it ever love it. Did well under a vertical pendant/250w Iwasaki. In the pic here, its smack under a 400w radium.
7. Dont cramp it. Give it lots of expansion room but still somewhat sheltered.