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I have had them before and never really saw a problem with keeping them.
They are fresh water inverts, kinda cool to watch. Especially if you have
nosey fish. The only problem occurs is if you have very small fish or fry
in the tank. They could be injured by the stings from the Hydra. Most
adult fish just flench and learn to stay away from them (eventually :-). If
you do want to get rid of then, you can do it by dosing the tank with
copper. Be warned, however, that if you have snails in the tank, they will
probably be killed also.