Personally I don’t cut nitrogen. I just keep them all a healthy shade of green from start to finish. Emerald harvest or any liquid nutrient I stay any from just because I’d rather mix my tanks and powders go further. That room with the grodan seems to need more light they’re stretching too much for my liking I keep that node spacing tight.
question on that room why grodan, a lot of 2 x 4 trays and 10 lights seems underwhelming for so many plants. Small room? Either way how is the rest of the room built out? Dehumidifiers, lighting, co2, controllers. I’m always interested in others builds.