The amount of food you give your fish is important. That said, do not overfeed the animal. You have probably heard this before and it is true. While overfeeding won’t make your fish explode, it will contaminate the water, making the tank an unpleasant place to live. In addition, an excessive amount of food particles in the tank can clog the filters, which also causes the water to become toxic.
It depends on the type, size, and breed of your fish. Try sprinkling a small amount of food in the fish’s tank and watch. Your fish should eat its fill in about five minutes. Experiment and take notes until you find appropriate amount for your fish. However, it is better to err on the side of caution — at least at first — and feed the fish too little rather than too much.
This will also depend on the fish’s breed and size. Most fish only require a once-a-day feeding, though some people like to split it into two smaller feedings. Consult your veterinarian or the fish experts at your local aquarium to learn about the daily requirements for your particular breed. But be aware that a fish will eat even when it’s not hungry. So there is no point feeding your water-bound pet three times a day, when once a day is sufficient.