Photography Help! Newbie problems

[NorteksGrows]

So these are a few different seedlings. I am trying to figure out the issues w these. They are all at 13 days. But just started showing these signs the past few days. Grown in coco w perlite. I did just find out they were being watered with 6.5 to 6.9 ph'd water. But this has been adjusted/flushed today down to 6.0. They have been fed with liquid advanced nutes coco and 3 ml of calmag was added to the ph adjusted water w 1ml per liter nutes to 1 gal total. Any ideas???? I was leaning towards ph problems but am totally new to problem solving plant issues. 65rh 75°f 69-72°leaf temps. 24hr light.

 

[Death The Cultivator]

So these are a few different seedlings. I am trying to figure out the issues w these. They are all at 13 days. But just started showing these signs the past few days. Grown in coco w perlite. I did just find out they were being watered with 6.5 to 6.9 ph'd water. But this has been adjusted/flushed today down to 6.0. They have been fed with liquid advanced nutes coco and 3 ml of calmag was added to the ph adjusted water w 1ml per liter nutes to 1 gal total. Any ideas???? I was leaning towards ph problems but am totally new to problem solving plant issues. 65rh 75°f 69-72°leaf temps. 24hr light.

Let the pots dry for a day or two. I don't know your EC or ppm but you want to water next time with whatever your nutrient schedule suggest and ph it 5.5. Certain nutrients get locked out at higher ph, in my coco I fill the reservoir with 30 gallons at 880ppm/.8 EC and ph of 5.5. I let my ph steadily rise to 6.2 but by that time I'm adding water back in.

 

[NorteksGrows]

For the first 7 days they were watered with under 20ppm distilled water but @ day 7 I started with 230ppm and up to 250ppm per gal @ 6.5 to 6.9ph until today (day13) when I learned it should be around 6.0. I bumped it to 500ppm per gal, ph'd to 5.97. This is the first run in coco only and apparently what I've researched has been somewhat wrong so far. So any tips are greatly appreciated. But I will definitely keep the ph down.

 

[Death The Cultivator]

For the first 7 days they were watered with under 20ppm distilled water but @ day 7 I started with 230ppm and up to 250ppm per gal @ 6.5 to 6.9ph until today (day13) when I learned it should be around 6.0. I bumped it to 500ppm per gal, ph'd to 5.97. This is the first run in coco only and apparently what I've researched has been somewhat wrong so far. So any tips are greatly appreciated. But I will definitely keep the ph down.

Try 600ppm with 5.5 ph. Don't let the coco dry out, water to run off. Always water with nutrients