Prognathodes guyanensis also commonly referred as the French butterflyfish or Threeband Butterflyfish is found in the waters of the western Atlantic, known from several places in the West Indies; from the Bahamas south to French Guyana and ranging south to São Paulo/Brazil.
The French butterflyfish is a deep reef inhabitant of rocky slopes (60–230 m) and a close relative to Prognathodes aya. It is known to feed on filamentous algae and small crustaceans as well as sponge.
Butterflyfish are not recommended for reefs as they will pick at or eat a wide variety of corals, fan worms, and other invertebrates. Most Butterflyfish are known to pick at Aiptaisia, a parasitic anemone.
West Indies, southern Caribbean to Guyana; 13 cm
Deepwater species, 60-200 meters depth; highly unlikely available; similar to P.aya but has one more band on body posteriorly; I photographed it in a shop in Saitama; easy to keep, but adapts cooler water temperature only
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