If you want a very good working generic way....put some water into a pan and bring to a boil. pull the boiling water into a syringe and stick it into the aiptasia and pull the trigger! you know you've done it in when you see a clear looking (like, excuse this, snot) coming from the crevice it was in. I use a fairly large syringe and after I fill it up I usually unload the whole syringe into the crevice. Once you touch it (with anything) it will immediately withdraw back into its hole. I use the big syringe and just keep pouring it into the hole. This works very well, and costs 0. and is environmentally friendly...