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So 6pm - 12 noon? = 18 hours/day, correct?but will keep the LEDs on from 6pm to 12pm.
I also tested my PO4 & NO3 today PO4 is at 0.19ppm & looks like zero for NO3. I use Hanna for PO4 & Salifert for NO3.
Nice!PO4 = 0.02 ppm Hana
NO3 = 0 Salifert