I found a similar solution to my aiptasia problem. This page recommends using pure sodium hydroxide from a chemical supply store instead of draino.
http://www.reefscapes.net/articles/b...a_control.html
It also gives some details of the process involved. I wasn't brave enough to use this method or draino so I used lemon juice and pep shrimps and it seemed to have killed them all. If I get a bigger outbreak I will most definitely consider it.