I have been trying to frag my colt coral for a week now. I cut it at a V then rubber banded it to a rock with all the water movement, I guess,it split in half and went floating. Then I tried the super glue method. That worked fine for awhile until the movement sent it floating again. Now I have glued it and rubber banded it. What I'm I doing wrong? I haven't killed it yet. Got any suggestions?