What option is best for ridding aiptasia from tank?

[Imlovinit]

Hey everyone my wife and I are new to saltwater and this forum. We have recently set up a 28 g nano tank. Currently it contains 20lbs live sand and 20 lbs of live rock. Also there are two blue damsels in there to help with the cycle. The tank has been running for a week, I have noticed that some aiptasia have hitch hiked in from a piece of LR. There is about five little ones so far and don't want it to spread. My question is what method is the best to rid of it from my tank?
1. Peppermint shrimp... Are these reef safe? We are looking to get into soft corals.
2. Injecting lime juice... Do you inject it into the aiptasia or squirt it close? How much of this is safe for the tank?
3. Kalk... I have heard this somewhere not quite sure what this is?

Thanks and any start up advice is muchly appreciated and or any other alternative options on getting rid of the aiptasia