I have a 1 foot silver and have several clown loaches that are 1.5 - 2.5 inches and no problems. Funny though if I put a rosy in about the same size and he nabs it right away....
I keep 5 baby neon tetras and 5 blue danios in with my 22'' Black Aro and 13.5'' ID. Shark. They have been in together for a while now and not one is missing.
I have a 20-22 inch Black Aro with a 2-2.5 inch female Convict and 2 males convicts around 3-3.5 inches, the tank is a 300gal (30in tall). Aro eats market shrimp, pellets, and peas, I have never feed it live food.