D4,

No that's not a mirror but mylar.
Like I said before have some upper leaves with leaf tip burn .So that seems to say too much nutes. Lower leaves seem to have a deficiiency of N. I'm just going to use plain water now. The new soil mix in the larger buckets should feed the plants.
I have only used shultzes about 4 times at half strength in the whole life of the plants. I did use some worm castings tea once.