Take out the coral, and use a nylon brush (new tooth brush should work). you want to make sure you don't do that while it's in the tank, that's how they spread. There is a product call Joe's juice, anything for mojo's will do.
I use Mrs. Wages Pickling Lime and you can get it at most grocery stores and Ive read even walmart and walgreens.
The ratio I use is 1 tsp of Lime to 2 tbls of RO water, microwave for 40 seconds, fill plastic syringe (over the counter) and then inject making sure you get the tip in the face of the aiptasia
I use kalk paste. No recipe just add some water to kalk powder till you have a thick paste add to a syringe and squirt the little bugger in the face! They suck it in shrink up and DIE!
kalkwasser, pickling lime and calcium hydroxide - all the same thing except you go to grocery store and ask for calcium hydroxide or kalkwasser you will get funny looks
kalkwasser, pickling lime and calcium hydroxide - all the same thing except you go to grocery store and ask for calcium hydroxide or kalkwasser you will get funny looks
Just be careful as lime will also kill what ever part of the favia it touches, that is kind of why I didn't recommend it. Even hot boiling water in a syringe will work.