I believe this is a symptom I have seen often and not cannabis specific…I believe you are experiencing salt toxicity! My advice is to get a EC (electrical conductivity) meter. check the EC of your nutrient solution and also check the EC of your drainage water. Also if you are recycling your media you may have to consider another approach. Remember that salts WILL accumulate in any media over time! If you don’t want to buy a meter you can run your samples in to any Ag or Ecological Lab and they can run the test quickly and cheaply…Good luck…hope this helps
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Precipitation can occur from using say fox farm nutes one watering then next watering using a different nutrient blend. I’m specifically thinking about the beastie blooms. They don’t have to be watered in at the same time to react. What ppm is your fertilizer watering? There seems to be issues with phosphorus and copper uptake, which can be so many things. Often too much calcium or magnesium can lock them out. Too high ppm fertilizer. Too much water or too little. Too little nutrients in general. Probably other things I’m not thinking of right now. Knowing your feeding ppm would help a lot.
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Im still standing by phos and micros. I make sure to TDS test every feeding. Also checking my soil PH. i dont worry about run off. but knowing the PPM in ypur food is key. since you flushed. all the micro and macri have been washed out. with a light feeding and TLC she should come back
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I agree. If you follow Fox Farm’s mixing instructions, it is taking you up to as high as 2100-2300ppm in solution (3.0-3.3EC). 
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I’ve been trying for days to find the pics of the damage this product can do when over-applied. Unfortunately it seems I deleted them off the old Ipad I used back then. Regardless, we once had an employee at a cultivation facility where I worked who swore by this product and actually made us start buying it for her rooms (much to my protest). She was, let’s just say “generous” with her feedings of the Beastie Bloomz and Cha Ching. Unfortunately, on the off days when she wasn’t feeding the Fox Farm nutes she was feeding “generous” amounts of General Hydroponics fully synthetic line (lbase + 5 supplements). Her rooms ended up looking, shall we say, “Apocalyptic”. You could almost hear the plants begging you: “Kill me!”
I am not speaking to either of these products, because they both work to grow some healthy plants…but not when you feed them together…even on off days. Toxic levels of both micros and macros can build quickly when the plant has been over-fed. At this point the plant can take no more food.
If my theory is correct, the remedy is fairly simple: my suggestion is to feed only RO water (or H20 with a low PPM) for a few days. You might want to include a product like Drip Clean, Flora Klean, or Clearex to aid in breaking down those excess salts trapped in your rhizososome. After the medium is allowed to dry, try adding 1/2 strength nutrients for a few days and see how the plants respond. Your yield may be impacted a bit, but your plants will be healthier. Consider it a lesson learned on mixing different nutrient lines and thanks for helping us all learn something. Feed less save more. 
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Also note. That LED growers should use like 50% less food then other growers. And also get away from that product line. Thats not anything against them. For me when i hear FF i think “Ahh a beginner been scrwed again” Look some people like FF. Im not one of them
This is one of the reasons why i preach “less is more” Look at the line ups some companies offer. How many products? five, seven, twelve? man thats a lot of stuff. Human Error Input or HEI is the biggest threat to the crop. I try to be very measured in my responses to problems when they arise. They always do. Try running fifty percent less nuets. Add some azomite or something similar. Also you are close to harvest. Check those trichs and if she is close that the loss and move on. The first lessons i was taught, was how to bounce back and move on from full crop loss. Its truly disheartening. however next grow you shouldnt have the same issues.
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The ph is from 5.5 to 7 % I use a 55 gal tank witch the ph goes up after I mix fertilizer. This is week 9 harvest next week. We use bio -wars for pests and neomatoads. No mold or pests right now. The temp runs from 77 to 42 degrees. I take out 4 gal daily from the humidifiers. Yea the leaves are very sun burn. I can only keep them about 1 ft from the lights right now. I didn’t say this is hydro. Thanks for the come back.
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Dan, When EC’s are in the 3.0 range you’re going to get all kinds of goofy nutrient symptoms… a lot of growers do not understand that when EC’s get high there are multiple physiological issues. #1 High level of salts shut down critical metabolic pathways (That’s why you see multiple deficiency symptoms) #2 the intracellular osmotic pressure differentials get so extreme that you are actually pulling cytoplasm out of the cells! Ideal EC about 0.7-1.0 and TDS < 450 FWIW…BTW it is interesting to note that the plant will make it’s best effort to translocate excess salts to the lower (less productive) leaves and sacrifice them while trying to preserve the apical meristem…neat creatures!!
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The PH shouldnt fluxuate that much. my target is 6.8 everytime. my soil PH is Always at 7.0 . thats a lot of variation and they dont respond well to that.
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