A new backcross of my Daddy’s Diesel, the number 4 plant, the mom is doing it, the flowering tester is doing it and the cutting that is the next mom is also doing it. An interesting light leaf yellowing?!.. I’ve never seen it before.
Just on new growth? All your other leaves look perfect to me. What are you feeding them and how often? It might just be a genetic thing
Could be genetic with the consistency…new and old growth. All 3 in soil…ultimate potting mix from fertilome with high phosphorus bat guano and worm castings added. Watered with my fish tank water and some house and garden nutes added in. The Flowering one is coming along, but still shows deficiency.
Maybe a little light bleaching? Are you using leds? And how close are they?
looks like sulphur deficiency
Try a little epsom salts. Couldn’t hurt
HPS 1000w roughly 30" from this one in flower. I will try some epsom salt. Just odd that it’s the only pheno from many, acting like this, but consistently through out the plant at different stages.