Wow, nice pond! Rushes of all types are common around here in upstate NY, and will be very tough to control since they will just re-seed out of adjacent areas our out of the fur/feathers/crap of wildlife. They cause no harm and I think are attractive as they don't get nearly as large as cat tails or some of the tall grasses.
Heck, I will take it if you want to share. I have a nice mud hole in need of some green.
