<a href=showthread.php?s=&postid=10234734#post10234734 target=_blank>Originally posted</a> by Hormigaquatica
Its not GSP, and its not bleached.
It is encrusting gorgonian- probably Briarium. If I remember correctly, GSP is no clonger considered Pachyclavularia, but has been reclassified as Briarium as well (making it a gorgonian too...).
Typically grows very fast, and can be quite invasive. It is aggressive towards neighbors, so give it some distance. Sturdy stuff.