I don't know......I run mine 24/7.....mines a drip system. What kind of deal are you running again Deja?

Also.....per my hydro guy...(who is god :jointsmile likes to run the grow nutes up to two weeks into flowering due to the burst of growth they go through after the initial turn. I follow about what Deja does......grow nutes the first week of 12/12 then shift over a few days to end up on bloom nutes by the end of the second week.

Deja.....if your plants are missing nitrogen.....and you are using your normal ferts plus Cal Mag......you either aren't giving enough or it;s not reaching your plants somehow. I have a feeling it's the second one because Botanicare is not skimpy with their nutes but I'm not positive because I don't know the breakdown of your nute numbers.

If it's there but not reaching the plant I can only think of two reasons......ph off causing lockout or fert buildup in your medium that's causing the same thing by blocking the roots access to the correct nutes and/or causing chemical reactions (too much salinity in your medium can lock out nutes and so can too much of one nute.....block out another's absorbtion) that are messing your plants up.