PW keep in mind that lemon juice is an acid. You are correct that it will melt aptasia. For everyone else as well, excess lemon juice, acid, will react with your parameters and cause your PH to crash. Be VERY careful administering it. Use a hypodermic syringe and patience.
i have heard, and we have dome this once or twice before. you cant take a syringe and directtly shoot them with calcium. they shrivel up and die. but be sure to get it as near thier mouth as you can and do not use to much. we have not done this in a long time because we have got the pepermint shrimp and havent had a problem with them since.
Melissa I think you got an extra "t" in your advice. I'm thinking you meant, "can" instead of "can't".
Kalkwasser powder is the best form of CA to smear over the offending critter. In fact Melissa it has been pointed out in many publications that it appears Joe's Juice is nothing more the Kalk in a bottle. The CA advice is another great way to control the buggers.