Aiptasia in Cycling Tank

So basically I think some aiptasia came with the LR I bought and if so I want to kill them before I introduce corals and fishes, and was thinking about the peppermint shrimp because I won't put any type of food in an tank without fishes and they would have to eat the aiptasias. On the other hand I heard shrimps should only be added at the end of the cycling process so I'm not sure what to do. The tank was built about a week ago with mature rock and it's a 50l ~ 13 gallon one.

PS. Sorry if I made any mistakes but english isn't my first language.

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