Now is the time to switch to growth food.
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 three times a day with enough food to keep them feeding for a minute or two.
A very important thing to remember with all fish food is feed fresh, store well. Even though fish food is a dried product and may appear perfectly appetizing the minerals and vitamins contained within it are gradually being eroded. I never feed anything to my fish that has been opened for more than 2 or 3 months. It is for this reason I purchase fish food in small quantities rather than in bulk. Store it in a cool, dark and dry place. In a sealed container if possible.