Fastbuds Mix Pack Auto RF3

Welly Day 3 there was some stretching, I added a bit of substrate and used the Photone App to set the light to ~260ppfd. Gave the first nutrients at 0.2g/L DryPart + CalMag, 30ml each to water in the new substrate. With each set of new leaves, I increased DryPart to 0.3 0.5 0.7g/L on day 10, and decreased the humidity under the domes a bit. When the third set of leaves started to show, light was increased to ~320ppdf.

Welly On day 14 they both have 3 sets of true leaves and started on their fourth, dome humidity is down to 65-70%. Domes come off now, humidity is ranging between 60 - 65% with a small humidifier. Light increased to ~400ppfd. They look a bit pale and the leave edges are getting lighter, maybe magnesium. I'm a bit behind on the nutrient schedule, will increase DryPart with the next watering and see if it gets better.

Welly Day 17: Noticed some light spots on the leaves, looking through deficiency stock photos and seems similar to a PH drift issue. Did a slurry test to confirm it, substrate PH came in at 6.5 which is too high and as I understand it, entering lockout territory. Flushed the substrate with 1L of PH 5.3 solution to hopefully correct the drift, a little runoff at PH 6.3. Still a bit high, but better. The first third of the substrate should be washed down now, lower areas are probably still too high in PH, but there's no roots down there yet. Next feeding might take a few days because it's all wet now, my plan is to decrease PH on the next couple of waterings a bit and use 5.5-5.6 instead of 5.8 to get it into the lower substrate. Once the autopots are turned on, it should hopefully help regulate the PH in the lower parts as well. I don't know where I went wrong, I buffered the coco and pebbles at 5.8, maybe I did it wrong. Or maybe it's because of my very soft tap water and the little amount of nutrients used during seedling stage, in combination with watering only small amounts at a time. The coco is pushing it up in PH because the water doesn't have much of a buffer on it's own? Still learning how to do it right, will test the substrate again in 1 or 2 days. Day 18: The flush seems to have helped, within 24 hours the spots got way worse looking, but didn't spread further. I'll take it as a good sign. Day 20: The substrate dried back a little and I did a second slurry test. This time the PH came in at 6.2 and EC 1.0, still not perfect but shouldn't block nutrient intake as much anymore. Plant 1 is recovering well, new growth looks alright. I think it can start bottom feeding via Autopot soon. Plant 2 is showing more signs of deficiencies, there are light round dots forming on the upper leaves. I believe it's in need of more Calcium, which would make sense because I was prioritizing DryPart over CalMag in order to stay within EC limits. Both plants have been fed with the same amount of nutrients and water but only one is showing the deficiency as of now. Next feeding I will start to dose CalMag at 1ml/L and PH at 5.6 to keep pushing down substrate PH.