Droopy Leaves. Brown chlorosis on new growth. Rep +

Hey, I have a problem. My plant has droopy leaves and brown chlorosis on new growth. Details are in the following link as well as pix. Thanks in advance.
https://www.rollitup.org/marijuana-plant-problems/760955-mystery-odd-ball.html

ph is to high. Above 7. add some ph5.5 water and those leaves will perk up by tommorrow. how did you test the ph of the soil? I had the same issue with some of my plants, added some ph down and they are all better now

I used a Soil pH meter. What are some reasons for pH fluctuation? I've added minimal nutes. Tonight is water night so I'll bring the pH down slightly for this one. As I mentioned, ALL these little ones are in the same FFOF soil. Curious as to why this one is being finicky. I can see how it may have become more acidic but more alkaline? Have you read anything about the soil being too acidic causing similar problems? Thanks.

Bump, bump bump bump bump bump, bump, bump.

high ph. some of my plants were doing the same thing, I gave them ph down and they perked right back up. there is alot more lack of n causing yellowing and rust spots all over every leaf with a low ph. have you read the threads at the top of the page that say.... check here first.... sick plant read this??

Lower ph might work, and might even try transplanting to either a similar size growing pot or a little bit larger pot, with half fox farm ocean and half happy frog...that should help balance ph of soil too. Good luck

Thank you for your support. I've checked the pH several times. The pH is 6.5/6.6 every time. pH of H20 is between 6.3 and 6.5 every time; I have a pack of pH test strips. 1 gal of 7.5 pH water + 1/4 tsp lemon juice (concentrate) NOT "lemonade." bringing the pH reading to a moderately orange color hence the 6.3 to 6.5 reading. 6.2 is more of a yellow-orange color.
I've decided it is NOT a high pH issue. I know you may disagree but I've checked several times. Your plants may have been showing the same symptoms but it could have been strictly a high pH issue in your case. The soil is FFOF as well which is notorious for getting increasingly acidic as the organic components are continuously breaking down. I've yet to hear anything about it becoming more alkaline. I'm thinking at this point it may be a cold soil issue + a generally problematic individual (possibly slightly over acidic water) seeing how none of the others are being affected except of course the three little seedlings nearby but they are young and susceptible another reason I suspect cold temps. I might add a regular 60W incandescent to try and raise the temps in the bottom of the box, might help with keeping pots warmer. I do not have a thermometer, as I type this I've decided to look around the house for a human thermometer and try that in the soil. Soil does feel a little cool but not so that I would expect a problem then again I am not a thermometer . Keeping in mind that a phosphorous deficiency can be the result of a few different factors including pH lockout - but also cold, wet soil or/and compacted soil. Thanks again for the continued support. Still on the fence. I'll be posting pics if there is any recovery over the next 36-48 hours to show anticipated progress.

if your talking about the two tiny leaves right where you topped it, i wouldn't worry about it. If anything it looks like it's getting a little too much nutes. I wouldn't worry about it. ffof always seems to be a little on the strong side at first. Temp might be a little bit of an issue, but you said it's too cold so idk. whenever i see kinda wrinkly leaves I think of high temps and too much nutes. could be overwatering as well but it doesn't sound like it from what you said in your other post.

Thanks. I found some info on Mandelas site a few weeks ago that said FFOF was commonly too "HOT" for seedlings. I had a 50/50 success rate so I'm assuming the ones that made it through alright were the strong, hardy ones These babies are in veg now, I'm trying to control for an increased F:M ratio 14 hours 6500K, high humidity, high nitrogen in soil, not currently controlling for potassium or soil temp but keeping stress to minimum from now til end of week 4 then lights are going on 18 hours a day and nutes will start to be added in higher quantities. The browning looks very similar to a phosphorous def due to lockout from cold/wet temps. Check the link sativa stuck up, the phosphorous def pic looks very similar. LMK if you agree. I can't just start making changes until I have a solid source foundation you know?