Some kind of deficiency?

[Chryniszzswics]

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.

 

[TrimothyLeary]

Usually that indicates you're low on nitrogen.

 

[Red Eyed]

How to fix Cannabis Potassium Deficiency (K) Pics & Symptoms

Leaves with a potassium deficiency have yellow, brown, or burnt edges and tips. It may look like nutrient burn, but the leaf margins also turn yellow.

www.growweedeasy.com

 

[EricHansen]

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

 

[Chryniszzswics]

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

6.3

 

[EricHansen]

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