I had a big one pop out of nowhere on a frag plug last month and had some kalkwasser laying around so I made a paste with rodi water and shot it at the mouth of the aptasia. Shriveled right up and hasn't come back yet.
Nanna, in my experience, if the slightest piece of tissue remains in the area, eventually the aptasia will grow back, even from under crazy glue. If you can take the rock out to pick or dremel out the area, I would do that, but that's just me. I glued zoa polyps right on top of where I had an aptasia and 5 months later I had an aptasia growing right out of the stem of a zoa! I wish I had taken a pic. hth