Pickling Lime
I have used it for Aiptasia and it works, but I had so many I got the peppermint shrimp and they did a good job.
I got this recomendation from GARF.
Prepare stock solution
1. 1 tsp. pickling lime - food grade calcium hydroxide
2. 2 tbls. tap water.
boil water and lime in microwave for 40 sec.
keep closed plastic container in cool place.
You will need a vet syringe from a pet store that sells vaccinations
This mixture comes out of the needle very thick. You do not need to inject the Aiptasia. Just release a small amount on to the aiptasia and it will take it in. This mixture seems to stick to the anemone, but it does not stick to the other inverts. We also use this mixture on problem hair algae.