Chaetodon declivis, commonly known as the Medium Butterflyfish, is a visually captivating species prized by experienced marine aquarists. This fish displays a unique pattern and vibrant colours that add interest and diversity to a mature reef or marine tank.
Care Level: Moderate to advanced care is recommended due to its specialised dietary needs and sensitivity to water quality.
Temperament: Generally peaceful but can be territorial towards conspecifics or similar species. Best kept singly or as a mated pair in larger tanks.
Diet: Omnivorous with a preference for meaty foods such as mysis shrimp, brine shrimp, and specialised prepared diets formulated for butterflyfish. Supplement with algae-based foods to mimic natural feeding habits.
Minimum Tank Size: A minimum of 150 litres (approximately 40 US gallons) is advised to provide ample swimming space and territory.
Reef Safety: With caution. May nip at coral polyps and sessile invertebrates, so not recommended for delicate reef setups.
Lighting Requirements: Standard marine aquarium lighting is sufficient; no specialised lighting needed.
Water Flow: Moderate water flow replicates natural reef conditions and supports fish health.
Placement: Mid to upper levels of the aquarium where it can swim freely and access feeding areas.
Origin: Not Provided.
Maximum Size: Typically grows up to 15 cm (6 inches) in length.
When introducing Chaetodon declivis to your aquarium, ensure stable water parameters and a well-established environment. Regular monitoring and a varied diet will help maintain optimal health. This species is best suited to aquarists with some experience in marine fish care.



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