I was away for a couple of days with my family and so I could not take the usual pictures that signal the end of the week.
I changed the lights to the 100 watts strips and increased the light distance to 16 inches, with the increased light distance I have noticed a few thing: (i) the leaves are real big, (ii) There's no purpling of the stems.
I also increased the EC to 0.4 (cal-max only); next feeding I will start some grow nutes to power the stretch and maybe some bloom nutes.