Unless you're breeding fish in the tank the only place that Hydra are a problem is between your ears! Relax there are lots of worse things to worry about! They're easy to get rid of and harmless to all but the tiniest fish.
The only thing in the tank are pest snails, assassin snails, and red cherry shrimp. Something tells me that the aren't too good for the red cherry shrimp shrimplets when they first hatch. I was wondering why I haven't been seeing more shrimp in the tank, especially since I have 5 or 6 berried shrimp at a time with tons of saddled shrimp in the tank at the same time. Hence, I think I'm going to have to deal with this problem instead of just letting it clear up on its own.