honestly at this point I think the video is more important to the goldfish versus the koi. Since there are so many varients of body types and finnage that are affected by the movement of the fish. I cant see the video working for the koi I dont keep my pond clear water that alone will make it hard for me to video the koi in the pond. Plus some people have black liners some blue some algea colored and some are rock bottomed it will be difficult.