Can Ajamaru Rainbowfish and Marbled Bichir Live Together?
Keeping Ajamaru Rainbowfish and Marbled Bichir together is possible but requires caution due to differing aggression levels. Provide a spacious tank of at least 285 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.
At a Glance
Can your tank handle Ajamaru Rainbowfish and Marbled Bichir?
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.
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Behaviour & Temperament
Ajamaru Rainbowfish is a peaceful species (2/10), while Marbled Bichir is moderately assertive (6/10). This notable difference means Marbled Bichir may occasionally assert dominance over Ajamaru Rainbowfish.
In terms of spatial distribution, Ajamaru Rainbowfish prefers the Top (Surface) and Middle (Open Water) zones, whereas Marbled Bichir occupies the Bottom (Substrate) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.
Worth noting: Marbled Bichir is nocturnal and will be most active after lights-out, naturally reducing daytime encounters. Also, Ajamaru Rainbowfish 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 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 7.2 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 8–15 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house Ajamaru Rainbowfish and Marbled Bichir together, plan for an aquarium of at least 285 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.
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 - Densely covered, Sand (Sifters), Driftwood (Digestion/Hiding), Smooth Gravel (Sensitive Barbels). Meeting these requirements will help both species thrive.
Both species do well with moderate (standard) water movement, so a standard filtration setup rated for the tank volume should suffice.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Ajamaru Rainbowfish and Marbled Bichir.
90 Gallon Standard
125 Gallon Standard
150 Gallon High
180 Gallon Standard
350 Liter (120cm Deep)
450 Liter (150cm Standard)
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Frequently Asked Questions
Can Ajamaru Rainbowfish and Marbled Bichir live together?
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 285 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do Ajamaru Rainbowfish and Marbled Bichir need?
A minimum of 285 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 Ajamaru Rainbowfish and Marbled Bichir 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 Ajamaru Rainbowfish or Marbled Bichir aggressive?
Ajamaru Rainbowfish is peaceful (2/10) and Marbled Bichir 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 Ajamaru Rainbowfish and Marbled Bichir need?
Both species overlap in the 7.2–8 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Does Marbled Bichir being nocturnal affect compatibility?
Marbled Bichir is most active after lights-out, which naturally reduces daytime encounters with its tank mate. This can actually be beneficial, as both fish get undisturbed time to feed and explore. Just ensure food reaches Marbled Bichir during evening hours.
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