I've had mixed success with pep' shrimp. Some will go crazy and eat every aiptasia there is and then others won't come near them. I would recommend buying some kalkwasser, mix some together in a cup of fresh water, then nuke it in the microwave until it starts boiling. Then take a TB syringe and inject the mixture directly into the little booger. It works every time. Plus if you wait a few weeks it could spread and create a real problem. Oh yeah.....great looking aquascape.