yeah and huge fish eat seals and sometimes people...that's the way of the world, right?
so let's feed feeder seals and people to the next white shark in monterey

big difference: in nature the small fish can escape, in fact they escape most of time
in most aquariums, there is no chance for the small fish
and we're not even talking about the chances of frogs and especially mice
like i said: i do understand the fun of watching your fish chase and kill smaller fish, but i wouldn't do it all the time
if not for the sake of the small fish, think of the parasites & diseases
edit: keeping fish just to watch them tear others to shreds is just wrong, and there's so many youtube videos of people keeping piranhas in bare tanks and delibarately starving them, only to watch them tear an oscar or arowana to pieces, i'm just sick of it
sorry if my posts were a little harsh