First time grower - Need Confirm on Problem (w/ Pics)

I started my first grow a couple weeks ago after reading these message boards for quite some time. I know that my first problem was too much water and I am pretty sure that my ppm (2000) was too high for my nutes. I have corrected both of those issues with a CAP Adjustable Cycle Timer and by dumping and remixing.

I am concerned that my room temp is too high. What are signs of that?

Nute burn,
see how the edges are?
And its a really common thing with hydropronics.

Thanks, NOB.