Day 43 : Watering with co2 tab / 5L. Also added food again because i think they need it. Increased ppm to 850. Maybe the next one will be pure water. Ventilation works all the time when lights are on. Temp and humi are stable and this is good for the girls. She has a lot of burns and i dont know why. Dont want to flush or something. I will let her take her way. Patience is the key always. Also removed some burned leaves from all ladies. She took 4cm in 3 days, so i guess stretching finished and start bud production.
Edit (Day 47) : Watering with co2 tab every 5L. DsD drank pure water because of burns. She has lost a lot of leaves from bottom. I dont know what to do. I will keep watering her with pure water to see if burns stabilized.