Yellowing slight burn on end of leaf

Grow Cycle Flowering
1

I think i may have a bit of nitrogen and/or cal-mag def. also thinking my lights may be too close(14-18 inches), three 300 watt full spectrum LED’s, 4x8 tent. 2 gallon smart pots, yes they are too small.

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2

5.5 weeks into veg…

3

Believe they are GSC, not sure…

4

That doesn’t look like veg to me. Those are flowering!