Indoor Yellow/pale leaves

[Budrippa2021]

Hey guys growing 2 autoflower og kush indoors from nirvana 1 is fine nice dark green leaves the other 1 is a week younger and seems to be getting pale green /yellow leaves both are using same soil its a living soil same plant food (pics included) including molases&terpinator
I'm at a complete loss as to what's causing it a thought maybe a cal/mag deficiency so added some cal,mag,nitrogen yesterday and it seems to have gotten worse so please help me find the issue its very bizarre that its only happening on the younger plant imo

 

[namvet25]

Give it some time to react to the calcium.Are you ph'ng your water?

 

[Jaydot]

That one does look hungry for something.
I don't know anything about dry amendments and living soil tbh but here's my 2 cents;

I would certainly test the soil's PH before anything.

But if you are certain about your basics, ph, ec, temp, humidity, etc.

I think you have to look towards Nitrogen or Sulfur deficiency,
I see you still have some dark green fans on the same plant so you can go from there.
Calcium interacting with Sulfur in a bad mix can also cause issues.

Maybe this can help you out.

Cannabis plants can develop symptoms of S deficiency, but the occurrence is much lower than, say, a nitrogen (N) deficiency. Sulfur and N deficiencies have very similar leaf symptomology. The key is observing where on the plant the symptoms first appear. Nitrogen is a mobile element, which means when the plant senses that N is low, it will remobilize N from the older leaves to the younger growth. That is why N deficiency symptomology of total leaf chlorosis (yellowing) initially appears on the older, lower leaves. (Note: With advanced N deficiencies, the symptomology will work its way up the stem into the middle section of the plant, which can confuse the diagnosis.)

Sulfur is a partially mobile element. In most S-deficiency situations, symptoms of leaf yellowing will appear in the middle section of the plant on the recently matured stage of leaves. This is the case when N is also amply provided. If at the same time, N levels are inadequate, S deficiency symptomology can overlap in lower portions of the plant in the same region where N symptomology will appear.