Goldfish are cold water fish and need less protein and more easy to digest carbohydrates than tropical fish sera goldy food flakes are rich in spirulina and wheat germ meal which is ideal for cold water fish in aquariums or ponds feed your fish with sera goldy flake food in the autumn to prepare them for winter hibernation and then in the spring to build them up again these flakes will provide your fish with all the nutrients they need to stay healthy