The plants look super-healthy, especially for being in those temps!!!!! In fact, there's nearly ZERO issues from the color of those leaves!!! When I was growing, I actually liked just a tiny bit of burn on the tips of the leaves, because I knew I was AT the tipping point for nute levels, so I felt that was a great place to be!!! I'd rather aim a little high and correct a little on the other end, than try to play catch-up when autos do their own thing!!! This thing looks like it's gonna be a biggun!!!!!!