we have a full size koi we e had for 2 years. His partner was taken by a raccoon. We've scared the raccoons away with a good hosing and they don't seem to be coming back. We bought 2 baby koi from petsmart and they both died within a week and a half. Bought 2 more and one just died a week in. Pond is well oxygenated with a fountain. I feed them once a day with 2 handfuls. I clean up all the keaves and pine needles on the pond everyday and we put that enzyme stuff in once a week for the leaves on the bottom of the pond. We e added full size in the past but only lost them to raccoons. Thoughts on what the babies keep dying?