Nirvana Blue Mystic Autoflowering

I got five seeds from one of our favorite banks and all five cracked in a few days. I included closeups of all five plants. They range from 4 to 8 days old with the size accurately depicting the length of time in the rockwool. I am using window sunlight a room with temp between 70 and 80 and PH water between 5-6. How do they look?

This is a bump as much as anything but I do have something to report. Where I live it is currently in the upper 80s with the promise of more to come for the next few days so I am taking my babies out of the direct sunlight and putting them under a desk lamp with a good light. I am probably going to water them next tomorrow but I am wondering if I should use a cooler temp water to cool them down a bit? Thanks. Any help is welcome.

Purchases I need to make....

Fan for air circulation
3/8 inch black tubing for my irrigation
grow tent
Sunburst convertible lamp