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I'm thinking about adding some fans to my 12x12x18 zoomed. I read about how benifical they can be but what cfm should I be looking for I found a 80mm that puts out 24cfm is this enough.
 

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That will be plenty. I have a 40mm in a larger tank then that and get good circulation. Your tank is only 1.5 cubic feet, and the fan circulates 24 per minute...Definitely enough, probably overkill!
 
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