The general checklist I would go through is, what soil are you using? It is a bit too early for any deficiencies to start showing as it should have enough in the seed for about 2 weeks.
It looks like it may be "hot" soil which the plants should grow out of with plain water.
The next step would be PH, I know you are waiting on one from your diary post. This is very important. Soil PH should be 6.5. Input PH will be 6.2-6.5.
If using organic nutes, feed at week two so they break down for week 3.
On the issue of your light question posed in your diary. I have multiple light meters and a few Mars Hydros.
I currently run 2x Mars Hydro 150w TS1000s, so pretty close to what you are doing. I keep em high and let the plants grow up into them.
Seedling/Sapling 100% power - 60 inches, this'll put you around 9000lux, 70umol.
Veg 100% power - 36 inches - gives you 20-50k lux and 150ish-400ish umol
Flower 100% power- 18-24 inches give you 50k-70k and 400-700ish umol.
Hope this helps! Happy growing!