Barneys Farm Pineapple Chunk Leaves curling upwards!!

I have a Barneys Farm Pineapple Chunk whose top leaves are curling upwards towards the light. (U Shape)
I had just moved this plant and another under my 600w hps a little over a week ago. I have the light raised pretty high 1 1/2 feet above the plants. I also have a fan blowing over top of the plants also.
I have been using Fox Farms trio nutrient line to feed my plants once every 3 waterings. I also transplanted them into 5 gallon pots a little under 2 weeks ago.
My temperatures stay around 75-82 degrees for the most part.
I also switched my 600w hps to 12/12 this morning after it being on 24/0 for almost a week.
What could be causing these leaves to do this?

Any help would be appreciated! Thanks Guys!

The plants could be responding to the heat under the bulb.......or possibly the beginning of a cal/mag deficiency.

Do you know what your humidity is dude? Also it could be the plant adjusting to the change (could). Peace

Not sure at all what the humidity is, and after seeing the curling I raised the lights about 5 inches higher and adjusted the fan to right over the tops of the plants.
And it's only 75-82 degrees in the room how could it be curling due to heat?
The pineapple chunk has looked shitty compared to the other ever since the beginning though.
Can the curling also affect flowering?

Yea, as another already mentioned, it could be the beginning of a CalMag issue. Mag Def will curl those margins up like that, along with Heat, but I guess we determined heat was not the issue.

What would be the best way of combating this CalMag issue? Dolomite Lime, epsom salts, or CalMag?
Also I forgot to mention the tap water I use runs through a water softner first which I'm pretty sure could be causing this.

Yep, if your filtering your water, you are probably pulling out the Calcium and Magnesium, so some CalMag+ will help get you back into the swing. (providing your nutes arent giving you plenty already)Also before you go adding more of anything,,, Be sure your PH is in an acceptable level.. If you simply experiencing PH Lockout, then that is an Easier fix. If you have determined by no uncertain terms that your PH is on the money, then go ahead and start adding as needed.

Is there any diy way of measuring the ph? I lost my meter about a month ago and have just been sticking to feedings every 3 waterings as reference.
Lol, I know I could be way more serious about this grow but I don't have the extra cash for a spare meter at the moment.

Curling up is almost always a heat and or humidity issue.

I can comfortably sit in the room and put my hands over the plants and hold them there for a couple minutes without them being hot.
I have no real way of knowing if theres a humidity issue either because I don't have a digital thermometer.
Any ways or ideas to really tell what the main cause of this is?

I would go with heat. Mag def leaf curl is more when the tips turn up. Mind you, the one time I had it, it showed up more as inter-veinal chlorosis. Epsom salts it's best and cheapest IMO for mag def BTW. Mind you, heat/light stress deep into flower can also result in the tips curling upwards. I think the plant tries to protect the buds by curling up the leaves around them. I had bad light stress on my last grow and the bud tips directly under the light actually turned pure white.

How do you suggest solving this heat problem?
Tomorrow I think I'll be watering both with an epsom salt/water mix. Think I might foliar feed also to rule out possibilities as fast as possible if curling keeps progressing.
I think I might add another small fan in a little bit to send some more air over top of the plants.
Thanks for all the feedback! More is more than welcome!

Foliar feeding is a good idea. When I had an Mg def, it took 3 day to look better but I put it in the res. Looking back, I wish I had foliar fed. What I don't like about cal-mag is that it's guessing which is the problem. Apparently cal is best taken in through foliar. Watching carefully.

Cool, let me know how that goes

are u using a open hood? an I think u need to invest in a $10 digital humd an temp thing from wallmart an a ph tester for cheep. cuz wit out knowing that info every thing is a guess an I don't think u really care about growing if ur cool wit just guessing.

Quite clear indication of heat stress .... Lift the light a little higher.

Yes it is an open hood. I'll be investing in a new thermometer and ph tester within the next couple weeks.I'll go down and lift the light a little higher but its already 2 feet above the plants and I'm afraid they'll stretch like crazy!Let me know what you guys think! Thanks!

Spend the $50 on a digital termometer w/humidity readings, and a ph meter. Surely this small investment will pay for itself in your next harvest. I believe that water softeners lower ph, so that could be the problem. Can you get water from the hose outside which may not be softened or anything?

I could probaly get water from my friends house. He lives in the city so there is some things added to it but I'm pretty sure it's better than well water.Tastes better anyways