DWC feeding during night cycle?

[MrWizard]

And dont do like me, I hampered 2 weeks of worth of growth due to a lack of preventive maintenance.

Check your ph calibration regularly!!!

First grow after a 40 yr break, 1 plant, DWC, LED 450W

Damn, damn, damn, I should know better. Another lesson re-learned! I have been struggling with a calcium deficiency for a week now, a bad one. Checked the nutes, they were in range. Checked the pH, always surfing 5.2-6.5 Looks like calcium is available at pH of 6.2 so I thought the pH was fine. Made some adjustments here and there but nothing helped. Low and behold my pH pen was reading 0.6pH high. So when I never let it get above 6.5 I was really only letting it get to 5.9, hence calcium …