Overview: The Mertens’ Butterflyfish (Chaetodon mertensii) is a visually captivating species prized for its intricate black and white patterning and bright yellow accents. This large butterflyfish is best suited to experienced hobbyists due to its specialised care needs.
Care Level: Moderate to advanced. Requires stable water parameters and a mature aquarium environment.
Temperament and Compatibility: Generally peaceful but can be territorial towards conspecifics or similar species. Best kept singly or as a mated pair in a spacious tank. Compatible with other non-aggressive fish but caution is advised with small invertebrates.
Diet: Omnivorous with a preference for sponges, coral polyps, and algae. Supplement diet with specialised frozen or prepared foods designed for butterflyfish to ensure nutritional balance.
Tank Requirements: Minimum tank size of 150 litres recommended to provide ample swimming space and territories. A well-established reef tank with abundant live rock is essential to support natural grazing behaviour.
Reef Safety: With caution. May nip at coral polyps and sessile invertebrates, so not recommended for delicate reef setups.
Lighting and Water Flow: Standard reef lighting and moderate water flow to mimic natural habitat conditions.
Placement: Mid to upper levels of the aquarium where it can graze and swim freely.
Origin: Indo-Pacific region.
Maximum Size: Up to 20 cm (approximately 8 inches).
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