Buddha Passion plant problems + heat probs

Whats going on roll it up community! Was hoping to get some help and input! I currently have a grow setup with the strains Blue Dream, Purple Urkle, and Buddha passion. The blue dreams are really thriving and getting fucking long!! The purple urkels are also doing pretty good with minor problems towards the bottom of the plant. The budda passion is the one giving me problems. The the tips of the leaves have a lil shrivel going on and seem to be growing a lil slower than the rest with pretty much all 5 plants that i have. I am using nectar of the gods nutes and have been feeding them every other day with a ph of 6.2. I Have a tent set up with one 1,000 watt light on them. I am thinking it has to due with the heat at the moment and am looking to get an intake fan to help pull in fresh air. The heat ranges from 75-85 during the day and 70-75 at night. I will post the pics and appreciate all the help i can get!