Some kind of deficiency?

I Use Biobizz light mix. (added some worm castings)
Nutes: RootJuice, BioHeaven and BioGrow according to the schedule provided.
Light: 400w HPS
Humidity: 50-60.
Temp: 24-28c.
Week 3 of veg. One of my plants started to turn yellow from bottom. Only first set of leaves seems problematic. the second set is also started to yellow a bit. What may be the problem?
the first set.
the second set which is a little bit of yellow on tips compared to upper leaves.

Usually that indicates you're low on nitrogen.

Do you use a Ph pen? What is your PH?

EricHansen said:

Do you use a Ph pen? What is your PH?

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6.3

if it's turning yellow from the bottom then that's a Mobile nutrient deficiency. I would probably up your feed a little bit and see how you get on