slight deficiency, dont know exactly what

I have 4 plants that are 2.5 weeks old and 3 that are 1.5 weeks old. all are in just right soil, under (2) 150w hps and (2) 85w cfls. All are a little yellow and the ones in the pictures are the worst. 2 days ago i gave the 4 older plants a very small amount of nutes. i use general hydroponics grow, bio root, and camg. I have other nutes but decided not to add those just yet. Did i add the correct nutes for this problem? under-watering maybe?

What soil are you using? Did you check the PH of your run off? Could be PH is too high. locking nutes out. I would flush soil with light nutes of "Grow" and "CaMg" like maybe 3 ml's per Gal. PH balance your water (6.2-6.

When I say flush, I mean like a 1/4-1/2 Gal. of water for each plant. Don't overdo it and drown your small seedlings.

What is your soil? looks like poison soil to me...

the soil is called "just right"

flushed all plants out yesterday afternoon with about 3ml per gallon of water of bio grow and camg. And they are already looking better today. Thanks for the help

No problem... Anything for the community.