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Filters are fine. I would guess you had enough flow, but that may be debatable. Most things say 2-3 watts per gallon for heaters, but that rating depends on how close the temp of the room is to the temp you want the water to be.
 

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Had enough flow from 2-2213s, even on the 40. Each filter would turnover the water in a 40 2.5 times a hour. 5 times water turnover is more than adequate for any tank. Easy to attain that with smaller tanks.
 
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