After spending a ridiculous amount of money on koi (all of whom died) I just went to Walmart and paid $5 each for koi and even less for regular gold fish. That was three years ago. This was the third summer for the koi who was about 3" long when I bought him and is now at least 16" long and as big as a small salmon, well maybe trout. lol. The others have grown commensurately. I had to thin out the babies, and even some of the adults this fall. My pond is about 2900 gallons and will only support so many inches of fish. If they keep growing then somebody has to go. I also have two shebunkin.