I have had a colt coral tied to a rock for over 2 mths now and it hasn't attached. I just used the toothpick method to try it. I put the toothpick through the middle of the colt where the yarn had been. Is this wrong, should I have used one of the ends instead of the middle. There wasn't any polyps there as both ends have polyps coming out. I hope I didn't mess it up. Any advise is greatly appreciated.