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In any tank under around 30 gallons, at least 50% of the fish tank water must be replaced every week to remove/reduce Nitrates that are created in the filter. A 'cycled' filter is used to convert the poisonous ammonia that is produced in the tank by the fish, first into Nitrite and then into Nitrate. The basic rules of successfull fishkeeping are. :- 1 inch of fish must have at least 1 gallon of water. Every tank must have a permanently running 'cycled' filter. Every tank must have at least 50% of its water replaced every week.

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15y ago

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