I just found my largest koi on the ground outside, he jumped out of the pond . He was the last of my 3 original koi that I had in my 55 gallon tank before I built the pond. He was a really pretty fish, he was mostly black, but he was orange on the bottom. R.I.P. I wonder why he jumped, I recently added one of my Plecos into the pond, but I don't think the Pleco would go after the largest koi.