Borrow some kalkwasser powder if you dont have any, mix up a strong solution, use a syringe and needle, put a shot of the freshly mixed kalc into the stem of the aptasia and that should do it. fill er up slowly until you get as much as you can inside and then just let it go. dont over do it and damage any adjoing corals by being too sloppy, but a little into the system will not hurt.