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There is no exact science to how many fish can be in an aquarium. The general rule is 1 fish per 5 gallons for freshwater. It also depends on how well the upkeep and filtration is, what type of fish, size of the fish when they are full grown. You can put 30 guppies in a 10 gallon but maybe only 3 or 4 small gold fish.

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10y ago

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