Leaves Curling down !

What is your experience level? experienced but not pro

Your Equipment:
.1) Type and wattage of lights. 5 x 1000 w HPS
.2) Distance from tops? 30 inches
.3) Reflector type? hood
.4) Is there a consistent fresh air supply? yes
.5) Do you have an exhaust fan and a circulation fan? yes
.6) What are the bulb wattages, kelvin ratings, and schedule? 1000 HPS hortilux 12 / 12 . first week of bud

Your medium:
.7) Specific brand and type of soil, PROMIX DX
.8) Size of container. 3 GALONS
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings? clones in 1 inch grodan cubes

Your nutrients and water:
10) Source of water? RO WATER 6.2 PH
11) Method of checking water ph. Pen
12) Method of adjusting water ph. PH up and Down
13) Specific brand and N-P-K ratio for each bottle. Flora Nova Series w/ Floralicious and Kool Bloom 800 - 1000 ppm
14) How often are you watering between feedings, and how much per watering? every 3 to 4 days until top is not wet , i water them good because they dry fast.
15) Any additives or tea's? Superthrive , floralicious and kool bloom , spray and grow with bills fertilizer and coco wet.
16) Are your ph levels stable, or do they fluctuate? stable
17) What is your ingoing water's ph? ...your runoff ph? in @ 6.2 out 5.9
18) Do you foliar feed? If so, with what, how often, and at what time do you spray? yes , just about the light are gonna turn off once or twice a week with spray and grow.

Your growroom:
19) Indoors or outdoors? Indoors
20) What size of closet, room or hut? room very big 30 ft by 40 ft
21) What are the temps and humidity levels while lights are on? ...With lights off? 80 on 70 off
22) Have you seen signs of insects in the growroom? none

Your strain:
23) What strain are you growing? super lemon haze and great white shark greenhouse from seeds and some clones from lemon haze mothers.
24) From seeds or clones? both , problems more apparent on clones though
25) Is this an autoflower strain? no

Leaves are curling down , new shoots are light green and very thin. I watered them heavily and had to turn off lights for 2 days because of an electrical problem and this is how they turned out.

`any thoughts on what should `I do , light is back on now. No more water will be added any time until they get better , but what else should I do .
This only happened on my Lemon Hazes , the others are fine see pic.

Thanks :jointsmile:

pics

In 6.2, out 5.9 says to me your TRUE soil pH is more like 5.7, you'll need to work on that. Also, check the pH AFTER adding nutes. The pH of RO water not only is meaningless chemically, but also cannot be accurately read by a typical hobby-level pH pen. Once you ADD shit to it, though, the pH becomes important.
I also see you are running RO water with no mineral supplement. Not only does that mean not enough calcium to the plants, but it makes the soil more susceptible to drops in pH over time.
Heavy watering plus extended time in the dark helps explain the problem as well. I take it your lights are back on?
How long have those plants been in the same pots? ProMix can sour quickly if you have any fertilizer/water issues. 6 weeks is normal; I've seen as little as 3, in extreme conditions. I always try to run my fertilizer solution WITH calmag if the water is even a LITTLE soft, and adjust it to right around pH neutral to offset the natural tendency of peat based media to drop in pH over time. Peat is really acidic; that's why those British bog mummies never decomposed.
Good luck.

I have no way of getting cal mag down were I live , so will it help to maybe use some tap water mixed with RO water to help a bit .
Also , do you recommend transplanting the plants to another pot , they have been in these for 4 weeks more or less.

If my PH in my medium is 5.7 I should have my solution be a bit higher to get the medium to raise , I will try my solution at 6.5 to see what happens next watering.

Thanks Stinky again.