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Just go for an even 6.0 which is slightly acidic and should help but won’t be anything too acidic for the roots and plants. There are other pest prevention techniques that would help with the gnats but not make your soil pH too acidic for the plant.

Also like smokeanagan said, it could be a ph lockout but your leaves still look attached. If the leaves and new growth are dying off raise your ph a couple parts per. The rusted spots are telling me your low on potassium and the iron and copper boron micros are rusting up. Usually tap water is bad for it because of the chlorine. Tea up some Epsom and cal mag and use that when you feed.

The little spots are from one of few things. Rather your plants are using iron from a deficiency such as potassium or magnesium in places it doesn’t need to stay alive. Usually from spraying leaves in lights on or other def. , or Your plants leaves are looking yellow because they are lacking nitrogen needed before flower. If you didn’t give enough nitrogen while in veg, it’s a 50-50 and I would use a 8-8-4 ratio during flower. Even though they don’t require much nitrogen during flower they still require a little. If they didn’t have enough nitrogen during veg, whatever nitrogen they do have left will get sucked in and that plant will die. To me it looks like a calcium issue because your preflowers have nice pistil formation. If the leaves only had crinkles on tips I’d say nitrogen or potassium , but where there are black spots on your leaves, Its telling me that the plants are using its iron to stay alive. I would use some cal mag every other watering and since your in preflower I would switch to a 2-8-4 bloom or I would go some black magic 5-5-5 all purpose and make a foliage tea to spray the leaves since it has the needs and calcium the plants might of missed out on. Look to see if the black spots have a purple tone to them. If so it’s iron. It’s not necessarily an iron deficiency it’s just use an extra iron and put it in places other than the roots. Good luck and I hope it helps

Hey Marc7201vos plantes reflète un blocage de nutrition du a un ph mal adapté. Veuillez vérifier le ph du sol utilisé et ajusté l'eau d'irrigation irriguer jusqu'a ruissellement répéter ce geste 2 à 3fois. #LoveUnityAndPeace