i have 3 aros, 1 6" leichardti that eats floating fd krill about twice a day, then my 2ft silver aro that eats every other day and gets market shrimp in LARGE portions. im talkin about 1/4lb sometimes more, and my 18"er gets market shrimp every other day as well n he eats a lil less then the big guy, the 2 silvers are in a 400gal tank, the leichardti is in a 150gal