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[ ... ]

Keep the NO3/K+/PO4 in good shape, 10ppm/10ppm/.5-1.0ppm and the GH at
5 or higher degrees. CO2 at 20-30ppm while the lights are on. Test the
pH in the am and the pm to make sure/certain there is plenty of CO2 in
there.
You use CO2?

What source do you use for K+ ?
Thanks Tom.