i have one, he's "the creepy fish" according to my roommates... they are nocturnal, and just kind of drift around during the day...
until you feed the tank. then they strike. mine regularly challenges my tang for mysis, and wins.
nothing violent.
they have huge mouths.
i've *heard/read* that they can predate smaller fish. they have huge mouths.... but it would have to be a huge cardinal and a juvie goby, probably. i have only heard it mentioned a few times.
really cool fish. mine has been single his whole life, and he's fine. small groups aren't necessary. very neat.
i like these fish focus threads.