I have no idea about the PH, but I use the same water conditioner as the other tanks (API I belive)
I wasn't concerned about water quality because it is getting the EXACT same care as the other two tanks.
The problem though was 100% the ight.
I put my hand over half of it and turned iit on, and he didn't react to it. But as soon as the light was completely uncovered, he flipped out again and returned to his coma state.
I put a plastic mesh over the tank, and the light now has a blue color instead of the intense white, so he's fine with that, after observing him.