If you have a minor aiptasia problem, all of the well know aip killers work well if you are dilligent.
It's after they become a problem and are in places a syringe cannot get to that people generally find they do not work as a permanent solution.
I had a huge genesis of aiptasia experience and found that at the end of a 2 year struggle, my 3rd copperbanded butterfly did the trick.
Thank goodness he eats frozen because there is no aiptasia now.
I tried nudis before, but they were picked off by my fish within minutes of adding them to the tank so I can't comment on their effectiveness.