It's highly doubtful it's pH related. These plants have been healthy and growing well and nothing has changed in the nutrient or watering schedule. Nutrients are prepared weekly and premixed in a 55 gallon drum, ph balanced to 6.2 and aerated. Parents are watered with either straight R/O water or nutes depending on the day of the week.
What's your run off soil can acidity over time no bugs? Would have to be like gnats or something affecting the roots not root bound? if not it either has to be root damage of some type or a virus but that would be the least likely what nutes are you using?
I will have to test the soil run off. I do have gnat issues in this room at the moment and have started treating for that. These were recently repotted (3 months ago) with fox farms soil. Root bound could be an issue as I believe the affected plants are all in plastic pots.
Will have a look at it.
I would defiantly have to say it's roots in one way or another so either you have one hell of a gnat infestation Or they are root bound your nutes are fine if your run off is good I'm leaning towards root bound only other thing it could be bugs like stated above could be micro mites like "russet" mites which are even worse then spider mites
