I have been interested in Mike Snaden's (Yumi Koi in UK) concept of koi growth and soft water condition, so when I moved all of my koi out from the QT tank to the outdoor pond I thought to myself, "what better way to learn this than to carry out an experiment myself." With the help of Arthur & Tony from Oregon Sunset Koi (who is a sponsor of this forum) I picked out a dozen Takahashi showa tosai ranging in size from 6.5" to 8.5". I also purchased two Ogata shiro utsuri tosai from another local dealer for the experiment.
Mike Snaden has always believed that a hobbyist can match or exceed the growth achieved by Japanese mud ponds. He states that the "magic" is in the soft water. In one article he reports keeping over 40 nisai in a 4,400 UK pond and still achieving phenomenal growth. The purpose of this study is to be able to achieve rapid growth in 14 tosai ranging in length from 6.5" to 8.5" in a 1,500 gal (including filtration) garaged QT tank.