Calcium deficiency in coco — brown spots everywhere

Same thing happened to me when I was overfeeding. Backed off the nutrients by 50% and new growth came in healthy within a week.

Environment is key here. What's your temp and humidity? Sometimes the symptom looks like a nutrient issue but it's actually environmental.

Don't panic! This is recoverable. The plant is tougher than you think. Make the adjustment and give it a few days to respond.