Checked them at 930pm and their numbers were:

Big Red: 6.2 PH, 1039 PPM
Tootsie: 6.4 PH, 1082 PPM

Mixed a top-off solution by starting with 1 gallon RO water, added Liquid Karma based on 5 ml for each gal of res. solution (res holds 3 gal = 15 ml total). Then added Sweet based on 5 ml for each gal of res. solution (again, res holds 3 gal = 15 ml total). Topped off both reservoirs and adjusted PH.

Final numbers:

Big Red: 5.8 PH, 998 PPM
Tootsie: 5.8 PH, 1002 PPM

They are starting to stretch a bit for the light, so I am training them under the screen. I expect to do this for maybe 1-2 weeks before letting them run their course and flower.