Can Mono Sebae (Brackish) and Red Tailed Black Shark Live Together?
Mono Sebae (Brackish) and Red Tailed Black Shark are not recommended as tank mates due to incompatible water types. Housing these species together is likely to result in stress, health problems, or direct harm to one or both fish.
At a Glance
Behaviour & Temperament
Mono Sebae (Brackish) is a generally mild-mannered species (4/10), while Red Tailed Black Shark is semi-aggressive (7/10). This modest difference means Red Tailed Black Shark may occasionally assert dominance over Mono Sebae (Brackish).
Mono Sebae (Brackish) and Red Tailed Black Shark both frequent the Middle (Open Water) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.
Worth noting: Red Tailed Black Shark is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 24°C and 28°C. Aim for the midpoint of this range (around 26.0°C) for optimal comfort.
Both fish can tolerate a pH between 7.5 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 12–15 dGH. Regular testing will ensure conditions stay within this range.
Crucially, these species require different water types — one needs freshwater while the other requires brackish conditions. This is a hard barrier to keeping them together. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Mono Sebae (Brackish) and Red Tailed Black Shark together, plan for an aquarium of at least 480 litres with a minimum length of 150 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.
Providing a mix of open swimming space and sheltered areas with rocks, driftwood, or plants will keep both species comfortable and allow natural behaviour.
Specific environmental needs for this combination include: Sand (Sifters), Smooth Gravel (Sensitive Barbels), Driftwood (Digestion/Hiding), Plants - Densely covered. Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Mono Sebae (Brackish) is a plant destroyer, which conflicts with Red Tailed Black Shark's requirement for live plants. Compromise where possible or prioritise the more critical need.
Both species do well with moderate (standard) water movement, so a standard filtration setup rated for the tank volume should suffice.
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Frequently Asked Questions
Can Mono Sebae (Brackish) and Red Tailed Black Shark live together?▾
No. This combination is not recommended. Key incompatibilities — such as different water type needs — make cohabitation unsafe.
What size tank do Mono Sebae (Brackish) and Red Tailed Black Shark need?▾
A minimum of 480 litres (tank length at least 150 cm) is recommended. This provides enough space for both species to establish their own areas and reduces the likelihood of territorial disputes.
What water temperature is best for Mono Sebae (Brackish) and Red Tailed Black Shark together?▾
Keep the aquarium between 24°C and 28°C. A target of around 26.0°C sits comfortably within both species' preferred ranges.
Are Mono Sebae (Brackish) or Red Tailed Black Shark aggressive?▾
Mono Sebae (Brackish) is generally mild-mannered (4/10) and Red Tailed Black Shark is semi-aggressive (7/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Mono Sebae (Brackish) and Red Tailed Black Shark need?▾
Both species overlap in the 7.5–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
How do I manage Red Tailed Black Shark's territorial behaviour?▾
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Red Tailed Black Shark space to claim a territory without encroaching on the other fish's area. Adding décor that divides the tank into distinct zones works especially well.
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