2 1/2 wks of 12/12 whats causing this is it heat stress? pics

i had my cfl lihgts like 3 inches away is this happing cause i have them to close i have since moved them away to bout 5 inches i just dont no if this is them being over nuted only happing to 2 out of 4 of them im growing in mg moisture control soil and use mg bloom nutes but cant figure why this is happing also should i clip off the burnt part of the leafs and leave the rest?

Not so sure about the curling.
I'm using the same soil as you and due to it's water retaining properties, suspect I'm seeing some tip burning from this . . . not really "over-watering" just basically staying wet too long . . . and MY grow room temps are a bit lower than ideal.

In your case, it's gotta be a combination of this and either the food, or the cfl's, which I suspect aren't too close, but have never really used them either.
I'd probably leave the damaged veg for now.

That is not heat stress.

Looks like a nutrients burn/pH issue.

iloveyou

Just pH'd my MGmc soil this morning, well, the run off from it, and it was a perfect 6.5.

The water I'm using goes in at 7.7 and I've added nothing else, as in zero. So maybe it was the bloom fert?

Leaf tips curl up like that due to a Mg deficiency, so i duno...how many CFL's did you have on it and what wattage?

i have like 12 alltogather 3 42 watts and the rest are 32 watts
and thats on 3 plants so whats a good way tofix ph level?
also shouldi stop giving it nutes intill it comes outa of it?

o and i got 3 floro grow tubes and thats in 5 squre feet my tempsare ushally 74-80
and humidty is ushally forty but im letting the humidty drop to 30;s cause i heard that helps resin the leafs?

should i cut the damage off?

it is very important to manage your pH, spend $10 and get some pH up and down, that is the easiest way of doing it unless you want to fuck with vinegar and baking soda, check the pH of the water before and after run off. I would flush the system using something that will release the accumulated fert salts. I use flora kleen, and it works well. After you give the system a good flush I would resume normal fert schedule, those symptoms don't appear to have any correlation to nute burn. Your temp and humidity sound fine, as well as the distance to the bulbs, so it isn't a heat issue; and I wouldnt even mess w/ trimming the damaged areas unless the leaf is 60% worthless.