Taco leaves and brown spots , led grow

My light is a 240w bs led. I have a 2 by 4 grow tent. I changed the soils about a week ago from a miracle grow soil that I believe was locking up my Ca and Mg. but about 3 days after I switched soil to a coco coir and vermiculite mix I started to get the taco leaves. Any ideas?

the light is about 18 in from the canopy

Are you feeding anything, Checking pH at all, Tap or RO water?..I suppose it could be transplant shock, u don't give much info

Keep feeding only water and cal-mag for a few days or so. Let the plant get out of being locked out. Changing from soil to coco can be a shock itself (totally different environment for the roots). Remember roots in coco like the ph around 6.0, rather than 6.8 which is what roots in soil like. After a few days of flushing with only water and cal-mag you should be able to start feeding again. Plant looks ok still to me minus the obvious previous lock out. Praying leaves means she's happy and trying to recover.

Sorry for that, I'm feeding sensi a and b, along with b52 and voodoo juice and I have botanicare cal mag + that I've been feeding for like a week now. And as for ph since I don't have a ph meter I couldn't tell you but I bought the soil at a hydro store and clerk said it was already balanced to grow our favorite herb. And thanks 619ster, I hope it helps. The temps in my closet are at 86 during the hot part of the day. I know people are gona say that's way too high but they've been like that since the start, actually they would even get to 90 before no problem.

Its just the leaves trying to dissapate heat. Its from heat stress and not a big deal. Raise you light 6" and get a fan to blow just below to the light to help with hotspots.