Ok, one of your nems got sucked into an intake and is more than likely gone{that is the milky colour}.. Uv sterilizer probably won't make too much difference one way or the other at this point, keep up the carbon going and if you have access to a hang on back filter, like an aquaclear or something similar you can run filter floss and carbon in that as well. Keep up with the partial water changes 10-15% per day over the next week or so{never asked, how big is your tank?}watch and test your water parameters and be patient. Try to see if there are any remains of the anemone kicking around and do your best to get anything that might be dead out of the tank. Change the carbon every two-three days and you should be ok.
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