Barbs are energetic fish that school in groups of at least 5 and can't be saved with slow or weak tank mates as they may be really reckless. The bonnethead shrimpfish has become the rarest fish globally, along with the marbled river stingray as well as the melon-headed whale shark. https://www.diigo.com/item/note/9tt3x/bm1k?k=7794d5e3223317f1952fd843a02e7c12