I have lots of halimeda in the tank that is going to house my RBTA. It's a sturdy calcerous plant that takes a little while to get established, but once it has, it takes off and volunteers all over the tank (it both roots in the sand and attaches to live rock). The green is a really nice visual contrast to anemones and corals. Just make sure to dose calcium regularly, and it should do well for you--it thrives in the high lighting anemones need.