Your zoa growth is very impressive... Zoas don't like my tanks. I guess cause they are always being stolen, or knocked off the rock, or covered with sand... Until I get some good glue, I can't help that though. I have some green zoas that have stayed 4 polyps for several, several months.. Which I don't understand- they are full and open.
I love those red ones with the long skirts, and lol to the marble frags...