Oh it's a Moina, that would have been my, well not my second guess exactly, more like my millionth guess
It always amazes me just how much life and diversity there is in the ocean. I would love to try deep sea diving one day, but the only problem is I get sea sickness quite easily. I only have to make a few waves in the bath and I turn green.
So anyway, thank you for telling me about the Moina , it's always good to learn something new