Emperor Angelfish

The Reef Destroyer (Not Reef Safe):

The Coral Slaughter. THE FATAL MISTAKE: You absolutely CANNOT put an Emperor Angelfish in a beautiful Reef Aquarium full of expensive, fleshy LPS corals (Brain Corals, Scolymias) or Maxima Clams. The Angelfish will literally view your $500 corals as an all-you-can-eat salad bar, violently picking at them and tearing them apart until they are dead, bleached skeletons. They MUST be kept in a 'FOWLR' (Fish Only With Live Rock) system with zero corals.

The Sponge Mandate and Dietary Failure:

The Face-Hole Disease (HLLE). In the wild ocean, their primary diet consists of highly toxic marine sponges that other fish cannot digest. If you feed them cheap flakes, pellets, or plain frozen shrimp, their immune system will crash and they will develop Head and Lateral Line Erosion (HLLE)—a horrific disease that literally rots deep, open holes into their face and body. You MUST buy specialized frozen 'Angelfish Food' blocks that contain real, blended marine sponges.

Tank Size and Grunting (The Talking Fish):

The 200-Gallon Minimum. They grow to over a foot long and are incredibly thick and powerful swimmers. Putting them in anything less than a 6-foot (180 cm) tank will cause severe psychological stress and stunt their shape-shifting color change. Fascinatingly, they possess a sonic muscle: when angry or fighting for dominance, they will 'grunt' and 'thump' so loudly that you can clearly hear the pounding noise across the living room through the glass.