I had about 4 aiptasia in my nano and I took an insulin syringe, loaded it up with concentrated lemon juice and injected it into the anemone and put it deep into the hole and blasted it. Haven't seen them since.
go with peppermints if you can...if boiling water or lemon juice doesnt work..get aiptasia-x by redsea..joes juice is basically the same as a kalk mixture, so dont waste your money on it.
oh and i wouldnt go with the flow or you may be sorry when your few turn into the entire tank