Milli as in Acropora Millipora
I used a Coralife 150W MH with 2x65W actinics on it over a 20G with no sump for nearly a year without issue. As long as you slowly acclimate your livestock to that light level you should be fine. I never used a fan for cooling but it was near a window, so that probably helped.
BlazingArrow here on CanReef is now using this exact same equipment to keep basically the same you are wanting to keep. In there he has 2 candycanes, 2 hammers, a torch, a good number of SPS (which are doing well), an RBTA with two clowns, a wrasse, a goby and a shrimp... no sump. The only heat issue he ever had was when his stealth heater flipped out on him and dropped to cold then to super hot in a day. PM him for a discussion and some pics of his tank.
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