Leaves Curling Up

Here are the photo's, its not a pretty site, any ideas anyone?

its too high of heat man!!! 50 cm obove the highet branch, i promise i've had same pproblem

I use pro as well and I have my ppm at about 1200 to 1600 but it all depends on the strain, my NYC Diesel and OG Kush can not take that much but my super silver haze cant get enough. I feed every 3rd watering. When growing several strains at once keep in mind they come from different parts of the world and have different needs. I would google the strain and find out. I also use a combo of Ionic And General Hydro and add molassis. You really need to know your strain.

one more thing you can have higher heat if you are sure your plant are getting enough CO2. Some strain grow in parts of the world where 90 is the average temp. Once again know your strain.