live mysis shrimp

I was feeding my nems and clown fish mysis shrimp right now, I waited 20 minutes to turn on the wave maker. Came back and I found a frozen mysis shrimp alive??? Should I leave it in my tank?

I have several different varieties of hitchhiker micro-crustaceans inhabiting my macroalgae aquarium (Copepods, Amphipods, Munnid Isopods, Mysis). However, I am surprised just how prevalent the Mysis shrimp are. If I simply stare at a tiny section of my rockwork or Sea lettuce for 5 seconds, I...