Can Clown Killifish and Neon Tetra Live Together?
Keeping Clown Killifish and Neon Tetra together is possible but requires caution due to potential behavioral clashes. Provide a spacious tank of at least 46 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.
At a Glance
Behaviour & Temperament
Clown Killifish is a peaceful species (2/10), while Neon Tetra is peaceful (1/10). This modest difference means Clown Killifish may occasionally assert dominance over Neon Tetra.
In terms of spatial distribution, Clown Killifish prefers the Top (Surface) zone, whereas Neon Tetra occupies the Middle (Open Water) zone. 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.
To improve the chances of a peaceful coexistence in this community tank: A larger aquarium with ample hiding spots can help diffuse aggression and give the less dominant fish space to retreat.
Water Parameters
The safe temperature window for both species falls between 23°C and 26°C. Aim for the midpoint of this range (around 24.5°C) for optimal comfort.
Both fish can tolerate a pH between 5 and 7. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 1–8 dGH. Regular testing will ensure conditions stay within this range. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Clown Killifish and Neon Tetra together, plan for an aquarium of at least 46 litres with a minimum length of 45 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.
Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.
Specific environmental needs for this combination include: Plants - Floating, Plants - Densely covered, Leaf Litter/Blackwater. Meeting these requirements will help both species thrive.
Both species do well with low (still water) water movement, so a standard filtration setup rated for the tank volume should suffice.
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Frequently Asked Questions
Can Clown Killifish and Neon Tetra live together?▾
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 46 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do Clown Killifish and Neon Tetra need?▾
A minimum of 46 litres (tank length at least 45 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 Neon Tetra together?▾
Keep the aquarium between 23°C and 26°C. A target of around 24.5°C sits comfortably within both species' preferred ranges.
Are Clown Killifish or Neon Tetra aggressive?▾
Clown Killifish is peaceful (2/10) and Neon Tetra is peaceful (1/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Clown Killifish and Neon Tetra need?▾
Both species overlap in the 5–7 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
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