Regal Angelfish
Given the right environment, specifically with smaller and docile tank mates like gobies and dwarf angels, it will start feeding within days when fed brine shrimp, brine shrimp plus flakes, and further progressing to regular frozen foods. With a hostile environment with fellow large angels, puffers, triggers, and certain clowns, it will almost certainly fail to acclimate and slowly die of starvation due to its shyness to start feeding. 
Scientific Name: Pygoplites diacanthus
Origin: Fiji, Indonesia, Madagascar, Maldives, Red Sea, Vanuatu
Lifespan: 15 years
Max Size: 8-12 inches
Food:  brine shrimp, flake, frozen
Required Tank Size: 125+ gallons