Saki-Hikari Deep Red Fish Food is a supplemental floating diet designed to help enhance the colour of your championship-grade koi and to add an extra pop of colour (Hiban) to their skin, with a minimum impact on the Shiroji (white area). It contains a precise amount of select, pure-cultured Spirulina, which naturally contains highly concentrated carotenoids to help your koi develop more rapid and deeper colouration while reducing the chance of discolouration of the white area.