Check it after the lights go out with a flashlight with a red filter.
I use a small LED light that came with clear, blue and red interchangeable filters.
What kind of light and flow is on it? I have been through a few things. Even dropped it on the floor when it came unglued from a piece of live rock. Looked like ground hamburger. Now it looks like this.
I have this coral as well. Luckily mine is always wide open with the lights on. They close a bit with the lights off. I bought one with 2 heads months ago and it still has 2 heads. Does anyone know how long they take to expand into more heads?