Can Clown Killifish and Yellow Lab (Mbuna) Live Together?
Clown Killifish and Yellow Lab (Mbuna) are not recommended as tank mates due to conflicting pH requirements and incompatible hardness ranges. 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
Clown Killifish is a peaceful species (2/10), while Yellow Lab (Mbuna) is moderately assertive (6/10). This notable difference means Yellow Lab (Mbuna) may occasionally assert dominance over Clown Killifish.
In terms of spatial distribution, Clown Killifish prefers the Top (Surface) zone, whereas Yellow Lab (Mbuna) occupies the Middle (Open Water) and Bottom (Substrate) zones. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.
Additional behavioural considerations to keep in mind: Hyperactive swimmers can stress shy, slow-moving species through constant motion.
Worth noting: Clown Killifish 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 27°C. Aim for the midpoint of this range (around 25.5°C) for optimal comfort.
The pH requirements of Clown Killifish (5–7) and Yellow Lab (Mbuna) (7.5–8.8) do not overlap, making it impossible to satisfy both species simultaneously.
Hardness requirements are incompatible: Clown Killifish needs 1–8 dGH while Yellow Lab (Mbuna) requires 10–25 dGH. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Clown Killifish and Yellow Lab (Mbuna) together, plan for an aquarium of at least 180 litres with a minimum length of 90 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: Plants - Floating, Plants - Densely covered, Leaf Litter/Blackwater, Sand (Sifters), Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Yellow Lab (Mbuna) is a plant destroyer, which conflicts with Clown Killifish's requirement for live plants. Compromise where possible or prioritise the more critical need.
Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.
Find the right tank equipment
Browse tanks, décor, and equipment suited for this setup.
Frequently Asked Questions
Can Clown Killifish and Yellow Lab (Mbuna) live together?▾
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Clown Killifish and Yellow Lab (Mbuna) need?▾
A minimum of 180 litres (tank length at least 90 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 Clown Killifish and Yellow Lab (Mbuna) together?▾
Keep the aquarium between 24°C and 27°C. A target of around 25.5°C sits comfortably within both species' preferred ranges.
Are Clown Killifish or Yellow Lab (Mbuna) aggressive?▾
Clown Killifish is peaceful (2/10) and Yellow Lab (Mbuna) is moderately assertive (6/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Clown Killifish and Yellow Lab (Mbuna) need?▾
Their pH requirements do not overlap. Clown Killifish prefers 5–7, while Yellow Lab (Mbuna) needs 7.5–8.8. This makes them incompatible in the same water chemistry.
How do I manage Yellow Lab (Mbuna)'s territorial behaviour?▾
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Yellow Lab (Mbuna) 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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