It would probably be cheaper to rent a small wharehouse space and setup the right equipment than to do a coral farm outside. The previous owners of the Aquadome in Austin had the same idea. They even had the covered greenhouses in the back, and they couldn't get the project off the ground because of the temperature extremes.
I pretty sure you've seen the threads on reefcentral with the greenhouse/coral farms. The money you'd spend on this project would probably cover a nice sized downpayment on a larger house.
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Groucho Marx