The how to water a potted plant was probably Emilya’s, it’s a great read for new comers. I’ve never read it, lol sorry Em! 
checking the PH of your run off, does nothing. A, it’s the wrong way to check the ph of your soil, and B, the run off buffers it’s own ph after running through said soil, (or coco). The proper way, is to take some substrate, and make a slurry test, out of that to determine the ph of soil. I’ve never bothered with it because I’ve never run into problems to where I needed to.
the outside plants look worse then the inside. Remember when your in coco, it’s considered a soiless compound and is considered a hydro set up. The optimal ph of your water that your looking for, is 5.8 for coco.
What I would suggest, is an immediate flush with close to 3X the amount of water, as the size of your pot your growing in. I.e.- your in a 5 gal pot, then 15 gallons of clean water. I mean who’s got the time for that... so if you run a large amount of water through, say, over the same amount of size in pot or more, should do the trick. So for easy math let’s say 6 gallons (because I have a three gallon watering jug) you run the fresh water through, and let it drain, after your done with the fresh water, have about a gallon of nutrient solution, and run that through right away so the plant isn’t starved of nutrients.
With coco, it’s also common to be feeding daily, if not twice a day, because coco, holds zero NPK value. So it’s important to have your nutrients dialed in for the right NPK value your feeding the plants.
what are you using for nutrients?
lastly, I wanna touch base on the signs of stress.
they almost look like calcium deficiency. A calcium deficiency can sometimes be difficult to diagnose since calcium deficiencies are often accompanied by magnesium, iron, and/or other cannabis deficiencies.
Remember that, once you figure out the problem, the damaged leaves may never repair them selves. So after the flush, following a feeding, then keep an eye on the healthier looking leaves to make sure it doesn’t spread. After you have determined your plants are happier, then you may remove the older damaged leaves, for better eye appeal.
so, I’d like to know what your feeding your ladies, and do you have cal mag? Extra Cal mag every feeding goes a long ways! I would say every odd feeding, but since your in coco, they might appreciate the extra calcium and magnesium
checking the PH of your run off, does nothing. A, it’s the wrong way to check the ph of your soil, and B, the run off buffers it’s own ph after running through said soil, (or coco). The proper way, is to take some substrate, and make a slurry test, out of that to determine the ph of soil. I’ve never bothered with it because I’ve never run into problems to where I needed to.
the outside plants look worse then the inside. Remember when your in coco, it’s considered a soiless compound and is considered a hydro set up. The optimal ph of your water that your looking for, is 5.8 for coco.
What I would suggest, is an immediate flush with close to 3X the amount of water, as the size of your pot your growing in. I.e.- your in a 5 gal pot, then 15 gallons of clean water. I mean who’s got the time for that... so if you run a large amount of water through, say, over the same amount of size in pot or more, should do the trick. So for easy math let’s say 6 gallons (because I have a three gallon watering jug) you run the fresh water through, and let it drain, after your done with the fresh water, have about a gallon of nutrient solution, and run that through right away so the plant isn’t starved of nutrients.
With coco, it’s also common to be feeding daily, if not twice a day, because coco, holds zero NPK value. So it’s important to have your nutrients dialed in for the right NPK value your feeding the plants.
what are you using for nutrients?
lastly, I wanna touch base on the signs of stress.
they almost look like calcium deficiency. A calcium deficiency can sometimes be difficult to diagnose since calcium deficiencies are often accompanied by magnesium, iron, and/or other cannabis deficiencies.
Remember that, once you figure out the problem, the damaged leaves may never repair them selves. So after the flush, following a feeding, then keep an eye on the healthier looking leaves to make sure it doesn’t spread. After you have determined your plants are happier, then you may remove the older damaged leaves, for better eye appeal.
so, I’d like to know what your feeding your ladies, and do you have cal mag? Extra Cal mag every feeding goes a long ways! I would say every odd feeding, but since your in coco, they might appreciate the extra calcium and magnesium
to 
Roy
