To use this NorthFin Goldfish Formula, simply sprinkle the appropriate amount of pellets into your goldfish tank according to the number and size of your fish. Don't overfeed; a good rule is to give an amount that your fish can finish in a few minutes. Store the fish food in a cool, dry place to keep it fresh. Make sure to close the package tightly after each use. If you notice any changes in your goldfish's behavior or health after using the food, stop feeding it and consult a vet. Also, keep an eye on the water quality in the tank, as uneaten food can affect it.