Please help! Nute burn? under/over water? PICS

Thanks for looking at my post. I have a total of 8 plants going, and one of em is drooping on the top leaves and looks like it might be nute burned of some sort. maybe the heat is to high in my room? stays around 80 degrees. please let me know what you think it may be and what i can do to save her. thanks!

drop the heat to 70, what kinda light u got? any nutrients? kinda looks like overwatering but im not to sure...tell me more about ur set up, what u got?

yeah i lowered the heat a little. its weird cuz i give all the plants the same nutes and only this one is doing something weird. i have 4 cfls and 2 shorter t5 tube lights. im getting an 8 bulb t5 from sunblaze next week. I am using nutes, but they are pretty weak, and i gave it all to my others and it didnt do anything to them. im thinking its an overwater, cuz i may have watered it a little more than the others. my medium is rockwool, i have 2 rockwools stacked on top of each other (i have used this technique before and gotten way better results than soil). sorry for not putting that in my first post. thanks!