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Sleepy Cod – Australia’s Chill Freshwater Mate
Sleepy Cod, known as Oxyeleotris lineolata, adds a distinct Australian vibe to your aquarium. This hardy fish, native to Australia’s rivers, grows steadily and displays a calm yet territorial streak. Consequently, it suits dedicated aquarists who can meet its needs. In this guide, we’ll outline its care requirements, helping you craft a perfect home for this unique species.
Size and Lifespan
Sleepy Cod grows to around 45cm, needing a roomy tank. With proper care, it lives about 5–8 years. Therefore, ensuring stable water conditions is vital. Regular maintenance, like checking water quality, supports its health and keeps it content in your aquarium.
Ideal Tank Setup
To keep your Sleepy Cod thriving, replicate its natural river habitat. A large tank with hiding spots and a sandy bottom works best. Moreover, maintaining consistent water parameters ensures its well-being.
- To replicate its natural habitat:
- Use a tank of at least 180 litres for space.
- Add caves or driftwood for hiding spots.
- Maintain a pH of 7–8 and temperature of 18–24°C.
- Install a strong filter for clean water.
Compatible Tank Mates
Choosing tank mates requires caution due to this fish’s semi-aggressive nature. It thrives with species of similar size and temperament. Thus, selecting robust companions prevents conflicts and maintains tank harmony.
- Suitable tank mates include:
- Silver Perch
- Large Rainbowfish
- Archerfish
Diet and Feeding
Sleepy Cod is a carnivore, eagerly eating frozen prawns, worms, and pellets. Feed it 2–3 times weekly to support its growth. Additionally, avoid overfeeding to keep water quality high. A varied diet ensures it stays healthy and active.
Breeding and Behaviour of Sleepy Cod
This species is calm but territorial, especially as it grows. It lays eggs, but breeding is rare in captivity without specific conditions. Therefore, focus on providing ample space to reduce aggression and support its natural behaviour.
Species Overview
- Species – Oxyeleotris lineolata
- Common Name – Sleepy Cod
- Origin – Australia
- Diet – Carnivore
- pH Range – 7 – 8
- Temperature – Tropical 18°C – 24°C
- Breed Type – Egg Layer
- Current Size – Approximately 7cm
- Max Size – Approximately 45cm
- Tank Size – Minimum 180 litres
FAQs
What size tank is ideal for Sleepy Cod?
A minimum 180-litre tank suits Sleepy Cod, providing space for its size and territorial nature.
Can they live with other fish?
Yes, they pair with robust fish like Silver Perch, but avoid small or overly peaceful species.
How often should I feed them?
Feed them 2–3 times weekly with carnivorous foods like prawns or pellets.
Do they need to be in groups?
No, they thrive alone or in pairs due to their territorial behaviour.
How long do they live?
With proper care, Sleepy Cod lives 5–8 years, depending on tank conditions.
Add a Sleepy Cod to Your Aquarium Today!
WA Customers: Note that Sleepy Cod requires an aquaculture licence and import documentation for Western Australia.






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