I have used kalk paste method a couple times with good results. Either use kalkwaser or pickling lime (which can be found at most grocery stores, Mrs. Wages or Ball's are the common brands) mixed with water to form a thick paste. I mix a good amount up. Load into a 10ml medicine syringe and cover the hole and local area. The trick is to block the anemone in. The anemone will dissappear and the paste will dissolve over time. I would recommend only doing a couple spots at a time because the kalk will impact the calcium and alkality balance of the tank.