I have a very very big, healthy, beautiful and pink Button Coral. I think that's what's it is called. Anyhow, it strecth over 8" when fully open so this is for very big tank. It is way too big for mine. Look at my album. I am just interested in trading for some various polyps (yellow colony, dragon eyes, and green star polyps). Hopefully on one rock. Doesn't need to be big. Let me know if you are interested.