Somepeople also use lemon juice or boilingwater but I am not sure how. If you search about on here you'll find it.
I have used Aiptasia X which does work on larger ones but I ended up getting one peppermint shrimp for my nano tank which has done the trick and makes a nice addition to my small set up
Aiptasia X was very poor when I tryed it at work. Diden't work the first three times, and a couple of my collegues also had issues using it... Adam19somethingsomething on here who is one of my collegues eventually got them, but it isn't the easiest product in the world to use.
Lemon Juce can be applied with a hyperdermic needle, injected directly into the leg of the anenomy
I used Peppermint Shrimp in mine Just make shure they are true Peppermints, as cammel's (a coral muncher) and a couple of others are sold under the same name and could caurse you issues if you aren't 100% on what you are buying