So I woke up yesterday morning still struggling with my yellow plants. I had to water yesterday. My PH runoff on Sunday after feeding was 6.1 on one plant and 5.8 on the other. Sounds ok right? (Or at least workable.) So yesterday the PH runoff dropped to 5.8 & 5.6 The plants new growth is still yellow and seem to be getting worse.
After research, along with what we already know, I was fully convinced PH has been the culprit somehow, even though the values (in) and (out) were better… I know, I know, (told you so! told you so!!) 
I thought I was going to be able to run a little water through them and then get the PH coming out adjusted. NOT!
Here is what I learned. All of this is my fault simply because I am still new to this growing thing, dang, for that matter, any growing thing…
This may not apply to everybody and may not be every bodies experience, but I feel sure it will be one more step to being more consistent with our grows.
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Rinse your coco before using it. I did not know that… live and learn, die and forget it all… lol Neither did I do it on my first grow nor my second grow. Lesson learned. (Could have been big part of the problem)
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Flushing, flushes PPMs out way quicker than the PH out.
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After the first initial 3 gal/per plant of treated water (nutes & PH’ed water), because I didn’t want to loose my PPM values, the PH continued to drop. (Lilt): 5.4 and (Precious): 5.2
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I decided to do a complete flush, I flushed with GH FloraKleen 1 tsp./gal. I ran 5 more gal. on each plant with 6.4 PH’ed water. PPMs dropped down to 70ish and my PH dropped to 5.0 on (Lily) & 4.9 on (Precious) even though I was going in at 6.4
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So the initial runoff of 5.8 & 5.6 was not actually the PH of my root ball.
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I continued to flush.The root ball was holding on to the low PH which I didn’t know it would do. I thought the first 8 gal or so would get it straightened out. (again, NOT!)
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I continued to flush another 8 gal of PH 6.4 water to each plant. The PH runoff slowly started rising, finally to 5.8. Keep in mine, this is a half gal at a time, checking after each half gal. I ended my flush by running 3 more gal of nutes and 6.2 of PH water through to get the PPMs back up as well as tweaking the PH closer to 5.8.
I know I could have saved a lot of time had I known the proper way to flush and am still not sure I did it the right way but it seemed to have worked. Plants still look like crap this morning but after all, I got through and zipped up the tent last night 2 min after the lights went out.
On another note, about a two weeks ago I noticed the temps were falling down in the low 50’s and RH was around 90% at night. Problem solved!
I can keep that area and room about 70*F all day and night and the RH coming out of the dehumidifier keeps my tent at night right at 40- 45%. All and all, It was a good day!..
Thanks for all the info @Not2SureYet Also, do you use RO water?
We’ll see how it goes over the next week.
2-19-19 Update:
Day 88 since dropping in water, Day 11 since starting my flip.
Pictures don’t look as bad as they do up close and live. But hey! We’re growing…lol 
Hmmm I just realized I am on the free side. I am not sure if I am allowed to post links to other sites besides amazon. I better check and see. 
