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I'm at 2nd week of flowering at the moment and I don't have a cooltube. I cannot run the lights during nights due to the noise the ventilation is causing. Humidity is around 30-40% during lights on and 60-70% during nights. I am still curious about my original question which haven't been...

Long story short. I finally put a proper temperature/humidity sensor in my grow tent and noticed that the temps go a bit over the recommended maximum (~30C/86F) from time to time, specially towards the end of the light phase. I have an 35 litre Aquasystem with 4 plants in a 1,2m x 1,2m x 2m...