Hi! I've had a RCS tank set up and cycled. I haven't had the chance to get any shrimp for it yet but I was staring into the tank just now and noticed so many tiny Hydra all over the place. How can I remove them before I get shrimp? I only have plants in the tank currently and somehow pond snails wound up in there too. I just don't want the Hydra harming the shrimp or shrimplets once I get them. Thanks!