Yellow leaves see attached

[smoorman]

This plant has had yellow on the leaves almost since seedling (it's still very young.) Gets same nutes as the others but it is a different strain. Calcium? Feeding them flora nova grow.

[Gingerbeard]

Perhaps a zinc deficiency?

How to fix Cannabis Zinc Deficiency (Z) Pics & Symptoms (growweedeasy.com)

[Rwise]

Root zone issues, such as PH, so whats the PH?

[smoorman]

Sounds like the solution in either case is a flush and maybe refeed with a 5.8 or so ph mix. Thank you gentleman. I'll repost in a week or so with pics.

[OldManGrower]

Planting in soil you PH needs to be between 6 and 7. 5.8 will result in nutrient lockout which may well be the case for this plant. Some are more PH sensitive than others but 5.8 PH is a death sentence.

[dilvish]

more info would help. set up, age of plants, watering practices etc. Judging by the picture it looks like a nutrient deficiency perhaps both nitrogen and magnesium. leaves are turning pale green and that's a sign of nitrogen deficiency. "veins" in the leaves could indicate magnesium deficiency. it could also be light burn as it appears the top leaves are only affected.