CalMag?

3rd pic is likely a mutation of some sort.. or if in coco a bunk batch, but it wouldn't be limited to 1 plant if so. maybe Mg deficiency.. doesn't quite look normal for it, though. Ca and Mg are 2 different thigns with 2 different sets of symptoms, for future reference. Good to break that habit of th emasses lumping them together as they are 2 unique cations that don't even bond directly to each other. 'cal mag' products are usually some portion cal nitrate and maybe mag sulfate? 2 or more uniquie molecules packaged together as 'calmag' ... calcium - yellow/brown spots Mg - interveinal chlorosis with rusty spots (orange/red color) When did this damage occur.. was it on the leaves a while back and mostly unchanged since? i'd be less concerned in this context. Seen light damage look like that, but then as the plant matures becomes more robust to it.. .just a temporary 'user-error oops' early on. Also looks a little like a boron deficiency, which would be unlikely... pH is fine and just rarely have a true trace element issue -- usually it's present but being locked out. Visible leaf symptoms are not enough on their own for a confident diagnosis for all be the simplest of problems. e.g. N-def is pretty distinct and easy to discern with just symptoms. watering habits don't look right due to drying pattern seen. 1) fully saturate (if soilless, 10% runoff required) 2) wait for appropriate dryback/loss of weight and repeat. the volume you give is whateer it takes to get the job done and not some inductively choosen volume off the top of your head. people want to give X mL per day, but that's just some OCD nonsense. you give what is needed to accomplish the task.. not a top-down choice by the grower. There is leeway in the process.. how much youallow it to dry is variable to some extent -- still need some minimum dryback for a healthy root zone.