Kleinii Butterfly (Chaetodon kleinii)

Chaetodon kleinii, commonly known as the Kleinii Butterflyfish or Sunburst Butterflyfish, is a hardy and adaptable species recognized for its golden-yellow body, subtle vertical brown bars, and blue-edged fins. Unlike many of its relatives, this butterflyfish is known for its resilience and ease of acclimation, making it one of the most suitable butterfly species for community and reef environments. Its constant foraging and calm nature bring both movement and warmth to the aquarium.

Origin: Indo-Pacific – from the Red Sea and East Africa to Japan, Indonesia, and the Great Barrier Reef
Depth: 2–60 m (6–200 ft)
Lighting: Moderate to high (enhances warm golden coloration)
Flow: Moderate; prefers stable, well-oxygenated conditions with open swimming areas
Tank Placement: Mid to upper regions with live rock and coral structures for grazing
Temperature: 75–80°F (24–27°C)
Salinity: 1.022–1.026 SG
pH: 8.1–8.4
Diet: Omnivorous – feeds on zooplankton, coral polyps, and algae; accepts mysis shrimp, enriched frozen foods, and marine omnivore blends
Temperament: Peaceful; active but non-aggressive toward tankmates
Size: Up to 15 cm (6 inches)
Care Level: Intermediate – hardy and well-suited for aquarists seeking an easier butterfly species
Compatibility: Semi–reef-safe; may occasionally nip at soft corals or polyps if underfed but generally peaceful and well-behaved