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How to set up a healthy goldfish aquarium
Get the right size tank for the size and number of goldfish.
Goldfish require more space because they produce a lot of waste during digestion. Provide at least 24 square inches (154.8 square centimeters) of water for every 1 inch (2.5 cm) of fish.
The more space your fish have, the healthier the fish will be. Place your tank in a convenient location with some natural sunlight.