I'm going to build a small pond on my back yard for my duckling Phil, the pond will have a pump and filter etc. (I will be keeping it as clean as possible, ducks are pretty messy). It's just one duck though, so I was wondering if I could add a koi fish or two. I know ducks enjoy koi food too so that could be a plus, but I read that duck poop contains a lot of nitrogen that can kill the fish. So, my question is, is there any way to have a duck and koi share a pond? Maybe a special filter for the poop, some kind of special plant, ANYGHING.
