Wedding Cake F2 Pheno here and she always shows this tip yellowing on the top leaves only. I'm having a hard time believing its fertilizer burn when no other genetics in a full 7k sqft veg room are showing any signs of burn. Max PPM's are 800-900. I'm leaning towards a micro nutrient issue, but I am having a hard time diagnosing. My colleagues and I will be sending in a leaf tissue test done soon to see what's really going on. In the mean time I would love to hear everyones thoughts. Thank you!