Thanks for your response.
I had a feeling that you might say something like this. For now, I am growing in the garage, light on for 12-14 hours daily, (110w Power Compact) with the system cycling 10 minutes on every hour, but with 3 cycles omitted. (an "every other hour" gap every 4 hours - I only have 20 slots on my timer) If nothing else, this keeps the
nutrients churned up in the tub, I guess.
I may have trouble with 2 plants in rockwool, but everything else is in clay pellet only.
Will keep an eye on the setup, and change course as needed. Thank you for your advice.