I got my Silver Aro at about 4 inches on December 6, 2009. It's now ~18 inches. (Growth was close to 2 inches per month till he hit about 12 inches. Then slowed down a little bit to 1-1.5 inches.)
Diet: Current Staple is Fresh seafood (shrimp, jumbo krill). When he was little, it was jumbo krill and freeze-dried bloodworm.