Some of the rare large species of fish that can coexist with invertebrates. They're voracious herbivores, relentlessly munching on algae. Get ready for a big tank — these big guys can quickly outgrow small setups! They're also territorial titans, especially when adding them to a tank already inhabited by some feisty characters. A change in color signals mood in this species. Remember to handle tangs with caution. Their sharp, scalpel-like spines can deliver nasty wounds. These spines are their ultimate defenders in the wild, shielding them from harm.