It is a cup coral from the looks of it, but a native one. Orange cup (aka sun coral) are now there as well. They are invasive though in SE Florida.What is second pic Steve?
Its been named Throat Punch but I've had a few different Id on it now. Came on gulf rock. Is it a cup or sun coral? Even resembles dendro. 100% translucent.
I have native ones in my sump under the drains. They really like a piece of mysis every now and again. My hope is that they grow into a colony that can be in the new custom sump I just ordered. If you want crazy PE from it, built a small egg crate house around it and shield it from the light. They come out and say hi with all they have when you do that. Edit: Put a tile on top, like a roof. Eggcrate alone is not enough lol.