I started my 77 with a 36" Hagen Glo with same bulb configuration as you. No dawn dusk, but I don't recall how many hours I ran the light at the beginning. I had no coral at the time, however a small mushroom appeared on its own after a few months. Maybe start with 10 hour photo period and work your way up to 12 once you see how your mushrooms react. What size is your tank & the Hagen Glo?
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