Strange leaf curl, and tips yellow on other plants

Hey guys heres my setup

250W HPS closet soil grow. Been feeing them pureblend pro veg. Temp around 75-80.

Pics i have attached show the problems. One plant has a twisting curl to it on some leaves. Maybe heat stress?
Other 2 plants look great but arent as dark healthy green and have leaf tips yellowing, which has been goin on for a little while.
Any ideas? Thanks you guys.
Viscera

Looks like heat stress,How close is your light?

Light was closer a week ago. Is now about 2 1/2 feet away now. Temp around 73.

r these seeds or clones im saying seed as they have greater demand for potsaium then clones do ,do u know ur ph /ppm at all but off top my head looks like potsaium/def due to ph unstable /lockout can u ph test water after nutes mixed pool kit from walmart will do wonders at this point cause u need ph in proper range for proper absorbtion also how lo g they been in those pots root bound?do u have pure blend flower try addind 20%in ur veg solution-20% for compensation of flower solution to the worst one with a good flush to balance ur ph and over fert problem u have all plants need 15% less veg solution or u r going to have slowest bud set in history lower N in week leading to flower nice green not dark will give u explosive bud set u can folair spray ph 6.0 plain water with wettn agaent to get excesse N out NOW as this can go bad quickly as u pots dry out ec climbs dangerously high n plants will pay the price of lower growth rate slow bud or even death Flush em lessn ferts n add little flower solution u good to go 100veg -40% add20%flower n h202 at 5ml litre so they dont drown from heavily flushed hope this helps sorry for rambling on also heat stress would show up at hottest point on plant most time tops will suffer this not middle growth

I was researching leaf curl and folding and ran across this post. For anyone else coming across this at a later date, I think Painkillerman stated it pretty eloquently. My reaction was Heat stress and or Phosphorous deficiency. A good thing to consider is the location of the problem, this can give clues to what the cause is. Instead of just thowing ferts at the suspected deficiency, you have to rule out "lock out" in the root zone. Make sure your PH is inline with your growing medium or method. Adding unecessary nutes can and often causes more problems with other lockouts. I don't think I can rep painkillerman, as I don't have many posts, but he certainly deserves some. Happy growing!