Growth food will not make your fish grow huge! And if your Koi is no Tom Cruise then the colour enhancing ingredients can’t work miracles. But feeding a good quality fish food with a mixture of balanced ingredients is an important consideration when providing a diet for your treasured fish.
Growth fish food contains a high level of protein to help develop your fish. Good quality fish food will contain animal based proteins as opposed to the cheaper vegetable based proteins contained in less expensive fish feeds. It may also contain colour enhancing additives and high levels of vitamin c.
Growth food should not be used at low temperatures. It is best suited to the warmer months when the fish are active and feeding vigorously. It is at this time that your fish benefit from the extra proteins and there digestion can cope with the richness food. I feed my fish 3 times a day with enough food to keep them feeding for a minute or 2.