The benefits of a refugium are many. In a nut shell, they are : increased water volume, nutrient export of nitrates and phosphates, helps stabilize pH changes at night, a place to cultivate copepods and algae as a food source for your fish and a place to keep your skimmer and heater. I cant think of any drawbacks to a refugium. As far as size is concerned, the bigger the better for increased total water volume of your tank and to have as much macro algae as possible to reap the benefits of nutrient export. For example, I have a 30g refuge/sump under my 120g 60" long tank and would go larger if I could fit a larger tank under the cabinet. You could use a refugium for just about any size tank IMO.
Hope this helps some. _________ 75g reef with Nova Extreme 8 bulb HO T-5 lighting, refuge, Remora skimmer, DSB, Seio powerheads, Acro's, LPS corals, assorted zoo's & mushrooms, Yellow Tang, Maroon Clown, Blue Cleaner Goby , Cleaner, Fire and Sexy Shrimp, Coco Worm, T.Crocea Clam, Derasa Clam
120g FOWLR, 260w Orbit power compact lights, Remora Pro skimmer, 30g DIY Sump/Refuge, DSB,Seio Power heads, Powder Blue Tang, Purple Tang, Flag Fin Angel, False Eye Puffer, Copperbanded Butterfly and a Moorish Idol 
Last edited by RAVEN; 12-29-2006 at 06:37 PM.
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Possible silly question 
