A colorful royal angelfish (Pygoplites diacanthus), photographed while scuba diving off the coast of Dar es Salaam. Though a popular aquarium fish, the royal angelfish rarely survives in the aquarium, as it requires a particular environment with smaller and docile tankmates, like gobies and dwarf angels. If in a tank with fellow large angels, puffers, and triggers, and certain clowns, they will almost certainly fail to acclimate and slowly die of starvation due to its shyness to start feeding.