French Angelfish

Geographic Origin and Biotope: Distributed in the western Atlantic Ocean: from New York to the Bahamas, Gulf of Mexico, Caribbean Sea, and along the coast of Brazil. Typically lives at depths from 3 to 100 meters, swimming over coral reefs, sandy rocky flats, and encrusted wrecks.

Taxonomy and Morphology: Known as the French Angelfish. It shares much of its massive size (40 cm / 16 inches) with the Emperor and Queen angelfish. Typical disc-like profile, with a minute protrusible mouth and an enormous body surface area that makes it majestic but unsuited for swimming in strong head-on currents.

Social Behavior: Angelfish with a proud, curious, and intrepid behavior. In the wild, it is often observed in stable pairs defending their territories against other conspecific pairs. In the aquarium, it has a swaggering demeanor and is very intrusive with the keeper's hands in search of food. Aggressive towards specimens of similar shape/color.

Coloration and Sexual Dimorphism: Juvenile coloration features yellow bars on a pure black background. As an adult, the yellow bands disappear to give way to a spectacular gray/black body where every single large scale is edged in golden yellow (scale armor effect). The snout becomes light gray and the eyes bordered in yellow. No known sexual dimorphism.

Aquarium Setup: Gigantic tank, minimum 800 liters (210 gallons). It needs dizzying spaces to swim in open waters combined with huge arched rock structures where it can shelter for the night. Keeping the aquarium clean is complex due to its voracious appetite which leads it to generate high biomass.

Diet and Feeding: In the wild, adults eat a vast majority of sponges, followed by gorgonians, hydroids, and algae. Interestingly, juveniles act as "cleaner fish", picking parasites from large Trevallies. In captivity, high-quality angelfish feeds, abundant Nori algae, krill, and blanched vegetables must be provided.

Water Quality: Extremely robust, perhaps the most adaptable among the large Pomacanthids. Tolerates slight fluctuations in salinity and temperature (24-28 °C / 75-82 °F), but demands pH between 8.1 and 8.4. The high organic load produced requires scrupulous mechanical filtration and massive water changes supported by powerful skimmers.

Compatibility and Tankmates: It will destroy the entire reef (LPS, SPS, clams, sponges). Suitable solely and exclusively in FO / FOWLR aquariums of immense gallonage. Perfect companion for triggerfish, large groupers, marine snappers, and large tangs. NEVER insert more than one specimen per tank, unless you have a confirmed pair in thousands of liters.

Aquarium Reproduction: Zero for aquarists. At dusk, the pair makes ritual ascensions to the surface, releasing eggs and sperm into the water column. The pelagic eggs drift pushed by the current. There are no captive breeding attempts given the large and sustainable availability in the wild.

Risks and Diseases: A species very resistant to parasites, but a guaranteed victim of Head and Lateral Line Erosion (HLLE) disease if the diet lacks vitamins and sponges or if poor, dusty activated carbon is used long-term.