My father in law built a small pond a few years ago. It's spring fed, and the water is around 55 degrees. At the damn it's about 20 feet wide, and probably goes up the canyon about 40 feet, before it becomes a little stream. This winter he started feeding the trout pellet food, and now there is a lot of moss, algae, duckweed or something else. Is this due to the food that he used? What is the best way to get rid of it.
I have read on here that you can add a couple of the white amor carp, and that would help. Will they actually do the job in water this cold?
What about this Sonar RTU, but will that work if the water is actually running over out?

Thanks for any help you can give. I will try to take some pictures and post them so you can see the pond.