Can Dojo Loach (Weather Loach) and Japanese Ricefish (Medaka) Live Together?
Yes, Dojo Loach (Weather Loach) and Japanese Ricefish (Medaka) are ideal tank mates. Both species share compatible water parameters and peaceful temperaments, making them well-suited for a community aquarium. They occupy different areas of the water column, which reduces competition for space. A minimum tank size of 240 litres is recommended.
At a Glance
Behaviour & Temperament
Both Dojo Loach (Weather Loach) and Japanese Ricefish (Medaka) are peaceful species with an aggression score of 2/10. Their matching temperaments mean neither fish is likely to dominate the other in a shared aquarium.
In terms of spatial distribution, Dojo Loach (Weather Loach) prefers the Bottom (Substrate) zone, whereas Japanese Ricefish (Medaka) occupies the Top (Surface) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.
Worth noting: Dojo Loach (Weather Loach) is a known jumper, so a tight-fitting lid is essential.
Water Parameters
The safe temperature window for both species falls between 10°C and 24°C. Aim for the midpoint of this range (around 17.0°C) for optimal comfort.
Both fish can tolerate a pH between 6.5 and 8. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 5–15 dGH. Regular testing will ensure conditions stay within this range. An aquarium test kit is recommended for monitoring.
Tank Setup
To house Dojo Loach (Weather Loach) and Japanese Ricefish (Medaka) together, plan for an aquarium of at least 240 litres with a minimum length of 120 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), Plants - Densely covered, Plants - Floating. Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Dojo Loach (Weather Loach) is a plant destroyer, which conflicts with Japanese Ricefish (Medaka)'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 Dojo Loach (Weather Loach) and Japanese Ricefish (Medaka) live together?▾
Yes. Dojo Loach (Weather Loach) and Japanese Ricefish (Medaka) are considered ideal tank mates. Their water parameters, temperaments, and behaviour profiles are well matched for a community aquarium.
What size tank do Dojo Loach (Weather Loach) and Japanese Ricefish (Medaka) need?▾
A minimum of 240 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 Dojo Loach (Weather Loach) and Japanese Ricefish (Medaka) together?▾
Keep the aquarium between 10°C and 24°C. A target of around 17.0°C sits comfortably within both species' preferred ranges.
Are Dojo Loach (Weather Loach) or Japanese Ricefish (Medaka) aggressive?▾
Dojo Loach (Weather Loach) is peaceful (2/10) and Japanese Ricefish (Medaka) is peaceful (2/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Dojo Loach (Weather Loach) and Japanese Ricefish (Medaka) need?▾
Both species overlap in the 6.5–8 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
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