Hey Mark,
With such a small retutrn section yoou'll proobably want to make sure you have an auto top off as your water level is going to decline quite rapidly with evap. I'm currently running a 20 gal sump and don't have an auto top off, I have to add water daily to avaoid sucking air into the return pump.
I've been trying to figure out how I'm going to make a modification to my stand to fit a 30 gal sump into it but its not looking promising. If I decide to to leave it as is and stay with the 20, I will also be ordering a Tunze skimmer, its about all that will really fit into a 20 gal sump and leave any room for anything else
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-captainhemo
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