Hi all! Just getting started in this fun hobby. My wife and I built a pond on our terrace about a year and a half ago and stocked it with 6 pond grade koi. They are thriving and have reached about 6 inches in length. The pond is about 450 gallons (11x3x2). After lurking and reading in this forum, I now know that's a pretty small pond. We've become quite attached to the fish, but now realize eventually we're either going to have to expand the pond, or find a new home for the koi.
I guess my question is two fold; What would be the largest koi we could keep in that pond, and how many is too many for that size?
Thanks for any info!