Robertsanswered grow question 3 years ago Too warm and you need calmag with coco. Your showing magnesium deficiency as well. Bigger potters for coco will help greatly. Just watch run off ph. It needs to stay between 5.8 for veg and 6.2 flowering. Outside of that range you will have issues with lock out. Been growing in coco for some time. Good luck and happy growing