Opistognathus castelnaui is a captivating jawfish species known for its distinctive burrowing habits and charming behaviour. This species is a popular choice among marine aquarium enthusiasts seeking an interesting and relatively peaceful fish to add to their tanks.
Care Level: Moderate – requires stable water parameters and a suitable substrate for burrowing.
Temperament: Generally peaceful but can be territorial towards conspecifics or similar species. Best kept singly or as a mated pair in adequately sized tanks.
Diet: Carnivorous – feeds on small meaty foods such as mysis shrimp, brine shrimp, finely chopped seafood, and specialised pellet or flake foods formulated for carnivorous marine fish.
Minimum Tank Size: 75 litres (20 gallons) recommended to provide sufficient space and substrate depth for burrowing.
Lighting Requirements: Standard marine aquarium lighting is sufficient; no special lighting needs.
Water Flow: Moderate water movement preferred to mimic natural reef or sandy lagoon environments.
Placement: Provide a deep sandy or fine rubble substrate to allow natural burrowing behaviour. Include rockwork with crevices to offer shelter and security.
Origin: Not Provided.
Maximum Size: Approximately 10 cm (4 inches) in length.
Reef Safe: Yes – generally safe with corals and invertebrates, but caution advised with very small tank mates due to predatory nature.
Opistognathus castelnaui is a rewarding species for hobbyists willing to provide the right environment and diet. Its unique behaviour and appearance make it a standout addition to a peaceful marine aquarium.
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