I built a new 1200 gallon Koi pond back in May (replacing the preformed 200 gallon plastic pond that I had for 3 years) of this year, and I left the fish in the pond for the first time with many worries. I have followed all of the rules of not feeding the fish once the water temperature drops below 50 degrees F., and have kept the pond oxygenated with an air stone. Anyway, the fish are doing great; just kind of lumbering at the bottom (4 foot deep) of the pond. We have had an unusually mild winter here in northeast Indiana, the the fish have been just a little bit active on the warmer days. I would like to thank many of you who had previously posted on how to overwinter Koi, as I have read almost all of the posts on how to do so properly. I can't hardly wait until the water temperature gets back above 50 degrees F so I can see my fish buddies swimming to the top at feeding time.