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This growbox is in the attic. The girls just entered to flowering stage so I turned on the exhaust ventilator. This caused that the temperature dropped drastically, especially during the dark hours. (The intake air temp was only 6-10C degrees)
Magnesium deficiency signs appeared on the leaves and I read about the problem. These symptoms appeared because of the roots are cold, the soil temp dropped below 11C degrees.
The tent is in the attic so I cut the ceiling and now the girls gets warm air from the house 😁
I mix always 5 litres fertilizer and now I put one tablespoon epsom salt to the water. (1tsp/5l)
It was too much humidity in the tent, so I had to do a homemade dehumidifier.
Its a simple plastic bottle and calcium chlorid pellet. In this small tent works very well. Now the humidity doesn't excess the recommended values.
I turned off the radiator due to the new hole from which they get the warm air.
They have overgrown and they get less light. Buds are still small and I think the harvest is post poned by 1-2 weeks. I try to change the light cycle to 20/4.