It doesn't like too much water or humidity. So be sure not to over water it. I stick my index finger in the soil or coco up to the middle joint. Pull it out and if my finger is dry, i water it. if its moist, i do not. This method will never fail you. You should have no problem getting jacks up there. If you're growing in just coco, you should invest in a bottle of humic acid supplement. The differences are huge. Humboldt makes a great one, The one from advanced nutrients is totally watered down garbage. humic acid is found naturally in soil, even then its not a lot, but plants go crazy for it. Research it for yourself too. Its not expensive and you only use about 1ml per gallon. Your grow looks great, and remember to keep your ph in range, dont over feed, over water, or anything else without researching it and asking. message me if I can be of any more help.