Scientific name: Acanthurus achilles Origin: Oceania to Pacific Islands, including Hawaii Maximum size: Around 18-25cm Cost: £250-350
A simply stunning species that will grace any aquaria but, like the Powder blue, it often suffers from parasitic problems and is frequently underweight when newly imported. Check that it’s feeding before purchase and, while it’s regaining weight, offer more food than you might usually provide to the aquarium.
Keep a close eye on water quality. If any species is worth going the extra mile for, it’s this one.