Told you man. It'll start off with some casual nipping when fish get in it's way, then soon enough you'll wake up to find a fish completely bludgeoned, with half it's scales and flesh missing.
my aro either eats them or loves them. There's no in between, if some other fish is aggressive chomp chomp bye bye. Yet the goofball has a pet guppy for 3 mos now. ????