The most ideal environment for Nishikigoi is the water of the huge mudponds in the Japanese mountains. To achieve the same waterquality in a concrete pond as in the mudpond, Mr Yamamura believes there are 5 principles required to achieve ideal water for koi. In these ideal conditions we can breed high quality koi that have beautiful bright skin and also grow well. Nishikigoi will always be more beautiful if the waterquality is the same in nature.
The 5 principles : Ammonia and Nitrite levels should be close to zero, the levels of Nitrite always below 100mg/l, there should be clear water to allow penetration of sunshine and ultraviolet, there should be consistent pH levels and Sufficient mineral levels within the water.