Leaves curled up towards the light

I am a newb grower and I have done quite a bit of research prior to posting including reading cover to cover the marijuana growers guide. i have five plants in three gallon containers in fox farm ocean forest soil. the ph of the water is 6.5 and i use worm castings and fox farm veggie growth fertilizer. the plants get watered every day and a half. the light is a sunsystem 600w hps light with super sun reflecter relative humidity is kept at 50 percent and the temp at 73. The light is being cooled by a duct running outside my window with an 80cfm fan with air coming in at 35 degrees. I also have another fan in the room as well. So my leaves are pointed upwards toward the light so doing my research i came up with either overheating or toxic salt buildup so i did a full flush of the soil with 4 gallons ph balanced water each and that was 3 days ago it doesn't seem to have worked. also i am growing three indica thc bomb and two sativa thai stick. any help would seriously be absolutely AMAZING i really have worked hard and dont want my babies to die. it's to the point where im losing sleep! haha well i'll say thank you to anyone that helps ahead of time. have a great day everybody.

attached are some photos for diagnoses

Fuck the old growth look at the new shoots,they look good.Wait until the soil is dry to water.don't over fertilize,add some "garden lime" to the soil.Keep the soil at a neutral temp.You don't need to spend $ on expensive ferts, for veg stage.Just buy a 8oz. bottle of Miracle grow liquid housplant food.It works great and it wont burn your plants,5 drops per cup.

same shit happened to me..i had only been giving it water at that point, tap water, and i started filling up bottles and leaving them open for 48 hours to kill all the chlorine and from then on theyve been straight as a diving board

Looks like I have the exact same issue. I'm growing in so-called aeroponics. I'm about to flush once before I change the rez Saturday. Check out the thread when it pops up.

Seems we have about the same temp... good pH... hhmmmh...
I'm about to start loosing sleep as well.

sounds like 2 much water let them go no water or very light water weed like a dry enviorment

That would make sense... since I transfered into my AeroFlo, I've been having issues. I've either had the pump running 24/7 or 15 on 15 off. I'm changing the timer for 15min on 30min off.

Hopefully!

Hey guys the curling has subsided it is still there but minimal and I can deal with that as it is not effecting growth. I ran into another problem though. Wilting and yellowing of the bottom leaves. These plants get watered once every two days...not soaked but watered. What the fuck is going on?

Looks like a hot rez to me.