depends on fish....some ive had killed everything else,some totally fine,some wussies,some only hated silvery fish.
my current guy is usually fine with everything.
but after i moved a few silver fish out,he started punking the tarpon.ALOT.
now my tarpons got lots of missing scales and torn fins....

still a great fish to own though.
remember to have lots of dithers in case...
the good thing is they dont have big teeth that do alot of damage.
but they sure are persistent.....

they do get mroe aggressive with age.
but if you start them with other fish from young then IMO it is USUALLY fine.
my guy only takes hikari pellets BTW...wont eat shrimp,smelt,silversides,or even feeders.



all the others ive had ate everything...