Koi cannot produce the colours themselves and need carotenoids( colourants) in their diet to help produce the colour. Hikari Gold and Saki Colour both contain Astaxanthin, a powerful colour enhancer, which will brighten up the orange/ red on your koi without affecting the whites. Poorer quality foods may make the whites appear creamy. Feed above 16C for best results.
Shirley Aquatics top 10 tips for perfect koi keeping conditions. From koi food and pond plants, to ideal pond filters and pond design! Everything you need to know to make sure you’re giving your pride and koi (sorry) the best possible care.