Hey, looks like an iron deficiency. Did you fertilize with manure? Do you use RO water? Sent from my SM-J700T using Tapatalk
You wouldn't supplement with iron. Also looks like it could be a sulfur issue. Either way, first step is to check the PH of water/soil. I wouldn't call it a goner yet - good luck! Sent from my SM-J700T using Tapatalk
It looks like Predator bled all over it .... so you probably wanna worry more about an 8 foot ugly mother f**ker than your plant ;-D
NOt a Ca deficiency, 100%. Looks like a micro issue, most likely Iron. (fe) Get some micros from whatever company your using and start applying that. Once applied, it should take 2 full weeks to pull out of it. Good luck.