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If it's fw then it's probably hydra but it's been so long since I've had them I'd have to say hit up Google for ways to get rid of them, I do remember they'll completely take over a tank though
It looks like hydra but my tank isn't cycled so I don't want to stress my fish even more then they are now. Would 3 zebra danios and two small shrimp be fine in a five gallon bucket for 1 day while I get rid of the hydra?