Can Red Tailed Black Shark and Taiwan Reef Cichlid Live Together?
Red Tailed Black Shark and Taiwan Reef Cichlid are not recommended as tank mates due to conflicting pH requirements. Housing these species together is likely to result in stress, health problems, or direct harm to one or both fish.
At a Glance
Can your tank handle Red Tailed Black Shark and Taiwan Reef Cichlid?
Compatibility is only part of the answer. Test both fish with your real tank size, current stock, and maintenance needs to see if you have enough space and a safe stocking level before you add them.
Behaviour & Temperament
Red Tailed Black Shark is a semi-aggressive species (7/10), while Taiwan Reef Cichlid is moderately assertive (6/10). This modest difference means Red Tailed Black Shark may occasionally assert dominance over Taiwan Reef Cichlid.
Red Tailed Black Shark and Taiwan Reef Cichlid both frequent the Bottom (Substrate) and 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.
Additional behavioural considerations to keep in mind: Two territorial species may clash over territory, especially in smaller tanks.
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.
The pH requirements of Red Tailed Black Shark (6.5–7.5) and Taiwan Reef Cichlid (7.8–8.6) do not overlap, making it impossible to satisfy both species simultaneously.
For general hardness, the shared comfort zone is 10–15 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Red Tailed Black Shark and Taiwan Reef Cichlid together, plan for an aquarium of at least 280 litres with a minimum length of 120 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.
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: Driftwood (Digestion/Hiding), Plants - Densely covered, Smooth Gravel (Sensitive Barbels), Sand (Sifters). Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Taiwan Reef Cichlid 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.
Why This Pairing Usually Fails in Practice
Red Tailed Black Shark and Taiwan Reef Cichlid are the kind of pair that can look acceptable in a shop but become a maintenance problem at home. The main risk is not a single number in the chart; it is the way incompatible behavior, water needs, or pressure on space compounds over time once both fish are established in the same tank.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Red Tailed Black Shark and Taiwan Reef Cichlid.
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
180 Gallon Standard
350 Liter (120cm Deep)
Show 1 more tank size
Frequently Asked Questions
Can Red Tailed Black Shark and Taiwan Reef Cichlid live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Red Tailed Black Shark and Taiwan Reef Cichlid need?
A minimum of 280 litres (tank length at least 120 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 Red Tailed Black Shark and Taiwan Reef Cichlid 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 Red Tailed Black Shark or Taiwan Reef Cichlid aggressive?
Red Tailed Black Shark is semi-aggressive (7/10) and Taiwan Reef Cichlid is moderately assertive (6/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Red Tailed Black Shark and Taiwan Reef Cichlid need?
Their pH requirements do not overlap. Red Tailed Black Shark prefers 6.5–7.5, while Taiwan Reef Cichlid needs 7.8–8.6. This makes them incompatible in the same water chemistry.
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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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 11, 2026
- Last updated
- May 11, 2026
- Issues or corrections?
- Contact the editorial team
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