I think the #3 will be plenty for that size tank
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120 Gal Reef Tank Born 12/06 160+ Lbs of Live Rock 80 Lbs Live Sand 25 Gal Sump with fuge 15 lbs of Live Rock and Macro (2) 250w 20K MH and (4) 65w CF Atinics (6) Moonlights Aqua C EV Skimmer (4) Hydor Korillia # 3s (1) yellow chromis (1) green coris wrasse (1) sailfin tang |