sounds good. your pictures didnt really show the entire plant,however. if it is heat related, it should only affect the tops of each plant (unless the room itself is too hot).

flushes are always good. doubt that its your problem, but theres no real reason not to give it some freash water to clean it out periodically. I also heavily mist my vegging plants to mimic rain during flushes. (dont mist flowering plants though, it may induce rot)

also, dont bump up ppm because of what i said. i have no hydro or ppm experience, and was just curiousity. :hippy: