You can really use anything for a sump.. If you plan on growing any macro algae within the sump just look for something along the 6500k light spectrum.
melev also has some good information
here
rsw beat me to it..
Last edited: Jan 11, 2008
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75 Gal : 140 lbs LR ; 120 lbs LS; 5-Turbo Snails; 3-Nassarius; 20-Cerith(and they are making more); 1-Ocellaris; 1-True Percula; 1-Gold Head Sleeper Goby; 4-Pajama Cardinals; 2-Feather Dusters; 1-Coral Beauty Angelfish; 1-Royal Gramma Basslet; 1 - Scooter Blenny; 1 - Bali Red Starfish ;Polyps and GSP; 1 Colt Coral; 1-Mushroom Leather; 1 - Maxima Clam; 1 - Bubble Coral; 1 - Rose Tip Bubble 'Nem; 4 - Peppermint Shrimp