Ok here's some shots of my acanthaphyllia id say on a good day it can get up to 11 inches in diameter. And it probly eats more than any 2 things combined in my tank.

DSC 0427 zps46f11738 - BIG Kohola POTM Contest - We have a Winner!

Im debating on which one I want to use for my final entry, I'll post it soon.