What happen with my leaf.

Coco for cannabis has a awesome editorial of how to buffer Coco coir for two 8 hour increments. It explains why with positive ions attracted to calmag. It steals all calmag unless BUFFER is done. That's the problem I will not forget that nightmare. It's hard to get stable. Toxicity to much Calmag verses not enough because Coco eats it all up. Lucky plant still a bit small.Try buffering some Coco and replanting in bigger pot . It's week two you have time to replant in better Coco .Well blessings on your grow my fellow grower. We all have went through these learning points. I grow DWC and Coco. Yesterday I just bufferd Coco. It took two days. It's worth the time when u see your girls happy. I have hope in your plant it has a lot of life and fight! Blessings on all u grow.