The sump is not really used in the wet/dry type application in SW. The main reasons to have a sump are :
Greater water volume = better water stability
A place to put a skimmer/heater/reactors
You can build in a refugium for to grow macro algae for nutrient export
Do you already have the tank/stand? or is it something you are looking at buying?
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- Greg
90G : Light - Tek 6xT5 | Skim - EuroReef RS135 | Flow - 2xVortech MP40W | Control - Reef Keeper 2
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