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There are several species of Molly. The common black/spangled molly grows to around 2.5 to 3 inches. If you folow the basic rules of sucessfull fishkeeping which 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." A single Molly needs at least 3 gallons of water.

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