A few more questions for you reef_raf before I give my 2 cents worth.
1) How big is your display tank
2) What GPH are you pumping back to the main
3) Are you considering making this incorporate a refugium
4) Do you have an UV sterilizer
5) How many gallons can you evaporate before it considerably effects your salinity
6)Do you have automatic water changing capabilities and how many g's do you water change at a time.
My first thoughts are 24 high and 18 wide try not to split the tank in half unless you want a refugium and utilize as much as possible the 24" high.
Kevin
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