Look like Zinc and Calcium deficiency? Watering w...

My BlueLab pen is bugging out unfortunately. Looks like my Reservoir hasn't actually been at pH 5.8 / 5.9. Reservoir has likely been at 6.2-6.4 for at least a couple of weeks. :/ Purchased a Hanna Growline meter and calibrated. Reservoir and holding tank are both reading pH ~6.35. Will be replacing with fresh nutrients tomorrow.

Thanks Organoman! Working on raising the fans. Will probably just add another layer to the cages to keep them above the canopy. Agree on the lights. All organisms need a little rest. I switched the schedule to 18/6 for yesterday. (Always just ran with 20/4) Gonna pickup a second PH meter today and compare readings. (suppose its good to have a backup anyways) I flushed the crap out of them a few days ago and runoff pH seems good. If my meter is off, then it’s likely been consistently off most of this grow. If meter is off, that’s going to be frustrating. lol This is my first try at coco and co2 and getting a couple curve balls this past week or so. Just feel like there’s a variable I’m overlooking. I know defoliation is controversial 😊 One thing I’ve found in runs in previous years is defoliation does help promote targeted growth. In nature, the plant’s primary (really only) function is simply to reproduce, and it will grow as much as possible to increase the odds its flowers get pollinated and produce seeds. It doesn’t care about uniformity in colas, level canopies, not having popcorn buds, flavor of its flower, etc (only we care about those characteristics). It’s just going to grow and roll the dice as much as possible wasting energy producing nodes that ultimately get taking over by other branches. Nature has only ever cared about one thing when awarding a species, live long enough to reproduce offspring that can do the same. When fan leaves layer heavily on smaller nodes below them, I rarely see those nodes turn into anything. When I remove them, they immediately start to grow into their own. They bounce back remarkably fast assuming they weren’t stripped bare. With that said, I do agree shouldn’t remove leaves just for the sake of removing them. They are the primary powerhouse of the plant. I’m currently recording a timelapse for this next week, will be interesting to see to how they respond.

Looks more like potassium deficiency to me, I think. Also, I would suggest not blowing the fans directly on the plants, but just over the top of the canopy. They will waste a lot of energy fighting the wind and this may be a cause for needing extra potassium, to thicken the stems for "wind bracing" needs. Another also, 18/6 is about perfect for photoperiod plants in vegetative growth. Cannabis can only grow so much in any 24 hour period, and growth tops out at about 18 hours, meaning running your lights any longer than 18 hours is basically a waste of electricity. Cannabis also needs to "sleep" and undertake certain metabolic processes, and 4 hours "sleep" is probably not enough time for these vital processes to be undertaken. Growth will be superior at 18/6, due to the plant receiving its healthiest light/dark schedule. You will not lose yield or potency by going to 18/6, in fact yield may even increase due to your plants being healthier at 18/6. Defoliation is a controversial issue with me, I do not believe in it, plants need maximum energy for growth, something that is both wasted and reduced by defoliation. To remove healthy green leaves to then force the plant to regrow new leaves, seems pointless to me (no doubt the plant "thinks" the same thing!). The covered "potential bud sites" (branches really) are relying on those leaves to make the energy they need to grow their best. The small leaves associated with the new growth can in no way produce as much energy a just one healthy green fan leaf. Besides, in 2-5 days, that branch will have grown out from underneath the fan leaf anyhow, making removing it doubly pointless. I have been growing cannabis for 35+ years and am yet to see any cannabis plant that gets rid of its own healthy and green energy producing leaves for no reason or benefit. Cannabis has evolved to grow her biggest and best flowers. Getting rid of perfectly healthy and green energy producing leaves are not part of that process. Think about how much effort your plant has put into growing those leaves for a reason, now all taken away in a huge waste of effort and energy for that plant. One step forward, two steps back, in my opinion. Nice set up though, more like a laboratory and indeed an example of careful planning and research. Very nice indeed. Hope this helps,........... Organoman.

I calibrated it a couple weeks ago. It's been pretty consistent since the start of the grow. May need to buy a second one just to make certain.