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[AGA-Member] How dark should be the "dark" period?


We usually provide our plants with 10-12 light period for photosynthesis. 

But what about the other 12-14 hours of darkness? how dark could they be? 

During the hot summer days I was turning on the lights during the night and in the morning/noon time the tank lights were off but the tank got tons of indirect sun light penetrating through the very big window in my living room. I noticed that plants weren't during very good and would like to understand if it was more of a heat issue (29-30C). 

I think plants need darkness in order to respire but this ends my understanding of this. 

Could anyone please educate me a little more? 

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