Cbdream rdwc

My ph is still off, waiting for ph down to show up. All netpots have some roots coming out of them, the biggest plant has a decent root growth into the water. Temp and humidity are staying pretty stable, so thats a plus. After turning down the light intensity to minimum, all the plants have stopped showing serious signs of stress, on the left 2 plants though, their growth still seems slowed. Ppm's have risen about 30-40ppm since I lowered it to 400 in the middle of last week, but I think ill stay the course rather than swap the rez, and ph down asap. Im not sure why theyre not taking off, in the past, week 2 is when I get tight, wide fan leafs, but all 4 of these still have a seedling look to them. They have more air in each bucket than my plants are used to, their roots are into the water. I added tin foil in case im getting light into the buckets. And added some calmag because the back right plant was darkening. In my experience, thats the first sign of a Ca deficiency.