Sweet seeds Cream mandarin XL autos x 4

12/12 Feeds gone up to 1.7 ec, definitely done them good. My ec pen may be out so I'll check it this week. I like humidity at about 70% around this time but my humidifier packed up and now isn't the time to be buying new kit so not alot that can be done I'm afraid. Still got the runt of the litter trailing behind. All healthy lookin though but I'm concerned the low humidity at this stage will effect the ability to get maximum yield.