My only concern is ith the green star polyps. With the way they grow, they can easily over take and cover all the other zooanthids on that rock. Yesterday, I noticed in our big display tank at work, the GSP had grown and covered some zooanthids and covered have of the the branching montipora. I broke off the remainder of the montipora to save it. It will be fragged.
GSP are cool, but can be like weeds. I like those multirocks, but like I said...I am concerned about the GSPs with the others.