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Discussion Starter · #1 ·
I know this is a newbie question but I have a 20g tank that I just got and am cycling with fancy guppies. 2 males and 4 females. During the day I have the light on but I was wondering how long should I leave the light on during the night? Am I suppose to just leave it on the whole time or do fishes need nighttime also?
 

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Give your tank 10 hours of light.
 
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