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Air pumps are devices necessary for Goldfish users to have in their tank. Air Pumps are necessarly only thing that can be used to put oxygen in the tank, if you don't plan on adding a lot duck weed or plants to your tank to make them oxygen then a air pump is right for you. Air pump keeps your fish from suffocating

A sign that your goldfish is suffocating if they're lying on the ground and heavily breathing.