Achilles Tang The Achilles Tang or Red-tail Surgeon, needs good water conditions and veggies including seaweed to survive in the aquarium. This marine species is rare and beautiful, with a purple body and distinctive red marking on the tail. The Achilles Tang is a vegan but will eat some meaty foods in the aquarium, if for no other reason than to mimic his tankmates.  The Achilles Tang is aggressive towards other tangs, but peaceful with similar size fish from other familes. The Achilles Tang is for experienced aquarium hobbyists. Scientific Name: Acanthurus achilles Origin: Hawaii Max Size: 8'' Food: Herbivore, prepared and fresh veggies Shipping Size: 2 to 5 inches