Get a ph meter. Add ph down until you hit 6.5 It's pretty simple. As far as your plant goes, I would give it a good flush. What type of soil are you using?
I do have a PH meter and the PH of the water is 7. How much PH down should i add to the water?? And we use a mixture of FoxFarm and Maricle Grow
mate, no offence but one table spoon is a bit much of super thrive, i add 5 drops per 1gal of water, and my babies love it
Fox farm is measured in tea spoons not table spoons if your going with table spoons your over feeding way to much
the way to do ph up and down is to add a couple drops , use ur meter, if its still high add a couple more drops. u kinda get the hang of it after the first time. just experiment with it. if you start at a ph of 7.. add a couple drops... will be at like 6.8 or something.... add a couple more drops ... should hit 6.3-6.5. thats ideal. good luck
Added: -150 hps -Intake fan And this is what else is in the grow tent(4x4x7): -Two 23w 2700k -One 26w 6500k -Three 23w 6500k -Another intake fan (but soon will be an outtake fan)