SOS! We have a problem occurring right now. A coup...

@Truwoodo additives like lemon juice baking soda etc are ok for emergency adjustments however the effects dont last very long You need a PH down product specifically designed for that purpose and feed/water your plants @ 6.5 However if you cannot get any ph down Liquid sulfur used sparingly will lower soil ph if used when watering

I do use white vinegar as pH down, there's no problem doing that as far as I read, and it's cheap/natural and maybe organic if you find one. As you are using GH you may make the whole week water solution and let it in a dark place not to get algae. Hydro nutes may stay 7~10 days without problem depending on the quality of your water/ reservoir cleanness. Remember that you must put the nutes in the order, and wait some minutes between each one introduced. The pH of the solution must be balanced 1 hour after the mix, to pH to stabilize. And I suggest you to don't add too much ph down, just a few drops and wait another hour to measure again. pH some times take minutes/hours to stabilize, and my get another values after some days. And calibrate you ph Pen, use your tap water as reference to check if it's stable. Mine must be calibrated every time I use.

@BlackCousin @Cbalderson60 @B4RNS So cool that you guys provide great help!

Just pour 10l of a feeding solution ( water + nutrients ) pH’d at 6.5 thru the pot. To stabilize the pH of the soil to 6.5 without flushing all the nutrients out .

Managing pH is crucial for cannabis plants to be able to take up nutrients through their roots. When the pH around the roots jumps up and down, it can stress the plant and cause brown spots to appear on the leaves. To fix your problem you need to pH at 6 and test runoff pH also since the pH of soil is at 8. When your runoff reaches around 7 you can start phing between 6.5 to 7 in veg and 6.0 to 6.5 in flower depending where she likes it. Yes you can use lemon but I recommend earth juice pH down its all natural and won't kill microbes in soil.

I think you should lower your ph asap to 6.0 with the ph down solution. It can also be done with lemon but your ph now its to high for your plants to uptake the nutrients. If you correct it to 6.0 the new growth will probably be ok. Hope this info was helpfull, keep on growing and Peace 👍