Pineapple Express AUTO (Fast Buds)

Week ending 07/16. Started with 3 plants, and lost one. I think the the third one ended up being under-watered as I'm always afraid to overwater autos in the larger containers. The other two that survived seem to be growing strongly enough. Still only using PH'd water, no nutes as they seem to be doing fine. I topped off their soil to help strengthen up their stems. Couple of yellowing spots on the newer fan leaves; I'm doubtful that it's experiencing any-kind of deficiency this early, and I believe it to be water droplets coupled with the amplifying of the LED lighting, but am continuing to monitor.