wikipedia has a good write up. Not sure why you would want three 3 foot fish in a 72” long tank personally even if it is 450 gallons but considering they were only 2” they probably were just too young to be introduced to a tank yet, were too stressed from shipping/handling, refused to eat and starved, or you had a
nh3/
no2 spike in your QT tank.
I assume you had either cycled your QT or provided a filter with a bacteria colony to keep
nh3/
no2 spikes from occurring.
The ph/
sg level differences from the
lfs and your QT could have created osmotic shock if you didn’t drip acclimate them long enough and death from this cause is most common in young fish or with mobile inverts.
Considering the options for
schooling fish that
are not 3 feet I’d try something else in the future.
The 3 fish would have maxed out your bio-load at adulthood anyways so maybe it’s for the best. Sorry for your loss but
IMO this fish should stay in the ocean.