thanks, that is the stuff i was originally thinking of. you beat me to the book.yardboy said:I've got something on a piece of rock that has been growing for six months or more, and is multiplying. Might be different that your stuff, since it seems to be single polyps instead of a colony like yours, even though they are multiplying. Anyway, p. 321 of Borneman's Coral book is the genus Phyllangia. Can this be it?