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Since a 12 gallon tank will actually hold considerable less when in use (Tanks are never filled to the brim and usually have some water displaced by gravel etc) The maximum amount of fish would be less than 12 inches. (around 10 inches) The basic rules of sucessfull fishkeeping are. :- 1 inch of fish needs at least 1 gallon of water. :- Every tank must have a permanently running 'cycled' filter. :- Every tank needs at least 50% of its water replaced every week. Folloe the above and your fish will stand a chance of survival. Fail to follow them and I can guarantee that your fish will be constantly getting sick and will live a shortened lifespan.

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14y ago
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13y ago

Depends of the size air raider you have, & how fast it pumps more oxygen into the water.

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13y ago

2 medium sized fish. if you have large/small fish, it's different. ask your pet store for advice

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12y ago

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Q: How many fish can live in a 12 gallon tank?
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