PH, Cal or Mg problem or all three? I have no clue....

Im growing in coco, using the three part GH flora series, and they have been flowering for 32 days under a 400w HPS.

I think the problem Im having is either a PH, Cal or Mg issue? what do you guys think? and how can I fix it!?

looks to me like u cooked it.. how hots ur canopy? how far r ur lights away??? give them more space as they grow fast in the first weeks of 12/12

better quality pics.

looks the same to me... cooked!

its not cooked those leaves are lower down on the plants.

the light is 24'' away and the room rarely get over 85

the 1 deff looks cooked, perhaps it touched ur bulb???

how many leaves on the plant look like that? and were are the leaves on the plant that look like that? maybe post a pic with the whole plant

3 leaves on one plant look like the first picture. Around 3 or 4 leaves on my other three plants look like the second picture.

also just did a PH check its 6.2. I believe thats in the range for growing in coco.

heres a group shot, pics of some problem spots and a bud shot

any ideas? I'm gonna water with epson salts for Mg deff tonight if no one has any other ideas.

thats not calium or magnesium. if it's not heat stress, i don't know what it is.

its a mag defficency just foliar feed with 2 tsp/l epsom salts dissolved