Sometimes peppermint shrimp eat aptasia, if there is no other food source. the same goes for any natural method of control....even the copper banded. You just have to incorporate a manual control method (like your Joe's juice) into your weekly maintenance routine.
The only thing I've seen injections of lemon juice or vinegar do is make one aptasia into four.
IME, you need to put some of whatever you are using on the mouth, then when it shrivels up into a ball, cover it with more poison.
I use kalkwasser, mixed up in a thick paste, and administer it with a syringe, less the steel tip.