Purple Ghost Candy 2

This one doesn't seem to be doing as well as my other. I've noticed some discolouration in the leaves and the stalk is going purple. I think there may be a Problem with N so I gave it a shot of N-27 and Guardian to help is along. I tested the PH for the first time in a long time and its a little on the higher side, so I will look at getting some PH down