most algae control in salt/reef tanks is symbiotic, it has to do with light and water parameters, if you are really worried that you will have an algae problem, you could look into a phosphate reactor, two little fishes makes one, looking at around a 120-150 setup to take care of the tank, that's pump, media, and reactor. most algies feed off phosphates and silicates, good ro/di water can help control most of that, watching your feeding schedual is another good way, over feeding is very easy to do in a marine tank.
hop on
www.marinedepot.com,
www.marineandreef.com,
www.reefwarehouse.com,
www.drsfostersmith.com, those are my favorite sites to buy from
I would agree with Mr. Reef, 20gal min sump, the more the better, i have a friend that runs a 75gal sump on a 60gal tank. the tank is utterly amazing looking