I had the same thing a few months ago. Mine was too small to inject with liquid calcium, Joe's Juice, Kalk or any of the many remodies. I initially pulled the piece of LR out, let everything retract and used frag glue to try and seal over the Aptasia. Didn't work. After many failed attempts, I had to remove the LR, cut through it with the dremmel and frag the colony into two pieces with the affect piece and some ZOAs tossed. Not the ideal way to handle it, but haven't seen one since.