I used a syringe to eliminate the 2 I had on a piece of LR. I filled the sryinge with a highly concentrated Kalk solution and repeated the injections for about 2 to 3 days, then I was able to pull off the entire aptasia with the syringe. Been gone for 4 months now. I think you could also angle the rock so the aptasia doesn't get much light, then it will extent more and will allow you to pull it out using the tip of the syringe. Good luck