Help!! I have a 3500 gallon garden pond. I was just told I need a uv light to help control the algae. Does anyone know anything about them? I have several goldfish, a few bluegill( to control the bullfrog population), & several waterlillies, & other water plants. We have a waterfall & stream built in, also. I'm just looking for the easist way to maintain & the uv light sounds great. Thanks ahead of time for your help!!! Laurajoyce