Please help me diagnose the issue on leaves

[Failed@Cultivation]

auto glueberry OG & Tangerine dream auto at 16 days old.
they are in 3 gallon fabric pots using promix HP and 20% perlite. I've been feeding with 1/4 strength Advanced nutrients 3 part every watering set to a PH of 6.2(tap water aerated) they are under an SF-4000 set at 24" above canopy. I did some minor lst 2 days ago. This isn't my first grow but it is my first time using promix HP(peat moss) please help me out and thank you!

 

[Failed@Cultivation]

It looks to me as they may have a calcium deficiency but i would like some more experienced opinions

 

[Mañ'O'Green]

Looks like a P deficiency to me but the plants look hungry overall. It is hard to tell with that light color. Diagnostic pictures should be taken in daylight color 5000K. How are you testing the PH in the Root Zone? Pro Mix has a pretty good rep but anybody can have a bad bag! If the limestone got shorted the PH can drop out of bounds with peat. IMPO 1/4 strength is too low, I use this to germinate. I generally start at 50% with all of the nutrient lines I have used and up 10% per week in hydro until tip burn then back off 10%. You may want to ramp up a little slower in soil.

 

[Failed@Cultivation]

Looks like a P deficiency to me but the plants look hungry overall. It is hard to tell with that light color. Diagnostic pictures should be taken in daylight color 5000K. How are you testing the PH in the Root Zone? Pro Mix has a pretty good rep but anybody can have a bad bag! If the limestone got shorted the PH can drop out of bounds with peat. IMPO 1/4 strength is too low, I use this to germinate. I generally start at 50% with all of the nutrient lines I have used and up 10% per week in hydro until tip burn then back off 10%. You may want to ramp up a little slower in soil.

Thank you for the tips! I will give that a try