Im still trying to figure that out too. I have fraged my colt about 3 times in the last three months, and every time I do it, it doesnt want to stay =. Ive tried glue, bridal veil, rubberbands and nothing works. I even saw one of my brittle stars trying to "steal" the frag off the rock. Whats that all about? I am going to buy a small breeder box that hangs in the tank, put some rubble and sand in it, and just try dropping the frags in. Let me know if you find a better way.