Tank's too small for most anthias unfortunately. As for the Triggers, I always leave that to Lynden
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Short answer; yes. For a few years at least.So will a blue throat trigger be okay(Xanthichthys auromarginatus)?
A juvenile could live in there, but adults will become extremely territorial and jittery in small tanks. Achilles Tangs aren't very suitable for aquaria in my opinion. They are one tang that seem to like to live in the "surge zones" near rocky shores rather than the slow reefs like most tangs; surge zones are difficult (and expensive) to replicate in captivity.One last thing, is the tank too small for an Achilles tang?
As far as I know, none of them will eat a longspine urchin. They have a formidable defense tactic; it is not the urchin who will be in danger in your tank.