With less feedings the water change regiment is adjusted. In the winer, I perform 100% water change only every second week, instead of every week like I do the rest of the year. The bio filter is working well and the UV sterilizer is always on, maintain a good water quality. In addition, I remove poop from the bottom of the pond each morning. Clay is added once a week.
For those of us whose ranchu aren't covered in snow and hibernating, it is a good time to enjoy them more and contemplate their beauty. Now is a less laborious time, but also the time to make sure that everything is in check, as the spawing season is just around the corner.