Yes, way too much probably.
72 x 3w = 216 watts
My entire 165g has only 280 watts at max and even with the whites at 70%, it was too much for many of my LPS. Now blues at max and whites are just barely on and it gives the tank a 15000-20000k look and the corals are loving it.
I would reduce your whites and max your blues to help make your corals pop and not light-stress them when you change the lights over. Just my experience.
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