I have two, umm fish, at around 8" that will down about 15-20 massivore pellets in one sitting!!
They use to be picky and only ate feders for months but its like some one switched a light swich and now they eat anything like crazy! I was feeding floating ExLg New Life Spectrum last night and they nocked a pellet clear out of the tank and it landed about 8ft away! haha
ive seen my 20" pacu easily take down 15-20 large wardley pellets. however like was said in a previous post, they inhale the pellets, not chew them, i swear.
ive also seen the same fish take 7 or 8 big algae wafers before they have a chance to hit the gravel.