This week was the best one until now. The humidifier and the space heater were able to maintain the temperature and humidity at the right levels.
This is the expected pace of growth, I think I'm 2 weeks behind compared with the last run, but is looking better now
DAY 26 - Water
PH - 5.76
Solution Temp - 20
PPM-609
Watering Volume per plant - 1.25L
DAY 30 - Nutes
PH - 5.60
Solution Temp - 20
PPM-956
Watering Volume per plant - 2L