One of the most gratifying things we did with our pond was to add an underwater camera. I bought ours on Ebay about 3 years ago and it has been running non-stop ever since. It came with about 60 feet of cable. I routed the cable to a wireless transmitter and have a receiver hooked up to one of our televisions. It's quite relaxing watching my pond from a fish's point of view! It was with the camera that we first noticed we had baby fish this year. Often one of our 3 crayfish will make an appearance. Well worth the investment as it gives you a whole new perspective to enjoy your pond!
Todd
Todd