Hey bro, by my experience with gorilla autos I never flush and they take 99 days seed to harvest, 15 weeks. If you growing in coco you dont need to flush, feed her till the end, once you feel that she is close to harvest wait 4 days without water for her to dry and harvest. Check it out my grows, I made 4 gorillas this year, no need for flush. flushing is a myth. doesnt change a thing on coco or lightmix