Cabbage Leather is the devil. Just kidding. Mine attaches to anything in about 2 weeks. I have a few frags from where pieces were just barely touching other rocks. I've given away or sold over 10 frags of this in the last month and I just can't get rid of it all. Apparently everyone else in my area knows how superdominant this coral is. Rubberbands work well, but I did have one piece where the rubberband but througth the coral over time. There is no wrong answer to your question.