#ed_op#DIV#ed_cl#I have used the kalkwasser method and it works! I took the live rock out of the tank and put itinto a small bucket. Used a very small amount of kalkwasser and placed it directly on the aptasia. Left it for a minute or two and then gently rinsed the rock and bingo no more aptasia. Then put the rock back in the tank.#ed_op#/DIV#ed_cl#