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A basic guide for determining the number of goldfish that can be kept in an aquarium is that each fish requires about a gallon of water for every inch of its length. A small 10 gallon tank can house about 2-3 small sized goldfish and 1-2 medium sized goldfish.
Overcrowding will result in poor water quality if the filtering system is unable to cope with the excess wastes being produced and the health of the fish will suffer. It is hard to supply adequate oxygen to accomodate an overcrowded tank. Overcrowding is also very stressful to the goldfish and it will make them more susceptible to different diseases.
Goldfish will be healthier and happier if given plenty of room to move around and grow..
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