well, personally, i'd toss those containers..
I HATE those things...
I've tried almost all growing containers, and the simple white square plastic containers are the best IMO.
what i'd do is take them out of that soil, and trans into something else.
chasing ph problems can be a chore, and oftentimes simply doesn't work.
hardwood ashes are a great way to increase ph, so is d-lime.
Problem is that you are so far off it'll be hard to correct it perfectly.
From the looks of the plant, the roots are going to be small/malnourished, so transplanting now won't piss them off much more than they already are.
My guess is that plant magic is peat based.
Just go buy a bag of soil, like Fox farm, vermifire, roots, etc.
You'll be golden after that, I wouldn't try correcting the ph in the existing soil, that can be a unwashed whore to do that...