I don't know what we did "right" or "wrong" to make them grow so big so quickly. I got them all at about 3" - 4", except for one that was slightly larger when we bought him. I feed them Hikari Gold or Hikari Staple food and Hikari Wheat in the winter colder temps. All of them are healthy and hearty looking fish, the silver calico looks rounder than the rest but doesn't seem to be eating more than the others. We were surprised that they grew so big! The petco store and Daytona aquarium guy said they would be fine in this size pond and even suggested we have more in there!!!! What are they thinking? I can't imagine them saying that just to get us to purchase more fish, knowing full well that they will outgrow the pond and that the water quality can be hard to maintain with that many fish it there. We do weekly water changes to keep the water clean and the ammonia in check. We use Pond Solutions ULTIMATE full-function water conditioner. We have a waterfall filter set up on one side of the little pond and a small "skippy" filter on the other. I hope all goes well with their move, and like you said CountyEscape, we all think they are the cutest!Also, I have no idea how you grew your koi to such large lengths in the size pond you have, unless you purchased them when they were larger. I have a 4,000 gal pond, and I feed my fish, and I know they have all grown a lot since first put in there on July 2, but the size of your fish? WOW!!! You must have been doing something right, and taking fantastic care of them for them to be such beauties! Yes, they will be much happier, and you will get new fish and learn to love them just as much as you do the ones you have now, but on a smaller scale. My motto on life, "Things work out for the best", and this situation is definitely working out for the best for all concerned! When you buy goldfish, pick and choose them for what you really want! I wish I could send you some of my babies that I have! Again, I just built my pond in May, fish went in first weekend in July, and I already have goldfish babies (the goldies were in before the koi, so they were there since mid-June). I have some beauties, but I know everyone else is the same, their babies are the cutest!