so far i think you have a very solid plan. the ventilation is one key to most larger tanks and i think you have that coverd very well. you might want to have an adjustment for the incomming air so the tank hood is always under a slight negative pressure. this will insure the moisture is removed from the room. it will also give you a means to cool your tank. the 1600 watts of mh light will really benifit the corals but will add some heat to the system. i would worry about that a little bit. you may want to hook up a geo thermal loop or a chiller. the only other thing you didnt get into detail about is the filtration system. that is the single biggest thing with any reef system.
also what is your plans for circulation inthe tank other than the return pump? cant wait to see this one up and running.
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