Can Allen's Rainbowfish and Apistogramma Mouthbrooder (Maulbrüter) Live Together?
Keeping Allen's Rainbowfish and Apistogramma Mouthbrooder (Maulbrüter) together is possible but requires caution due to differing aggression levels. Provide a spacious tank of at least 150 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 Allen's Rainbowfish and Apistogramma Mouthbrooder (Maulbrüter)?
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.
Shared setup supplies
We may earn from qualifying purchases
Behaviour & Temperament
Allen's Rainbowfish is a peaceful species (2/10), while Apistogramma Mouthbrooder (Maulbrüter) is moderately assertive (6/10). This notable difference means Apistogramma Mouthbrooder (Maulbrüter) may occasionally assert dominance over Allen's Rainbowfish.
Allen's Rainbowfish and Apistogramma Mouthbrooder (Maulbrüter) both frequent the 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.
Worth noting: Allen's Rainbowfish is a known jumper, so a tight-fitting lid is essential.
To improve the chances of a peaceful coexistence in this community tank: Provide a significantly larger tank (at least 50% more volume than the minimum) to allow both Allen's Rainbowfish and Apistogramma Mouthbrooder (Maulbrüter) to establish separate territories. Add plenty of line-of-sight breaks using driftwood, rocks, and dense planting to reduce territorial confrontations. 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 6 and 6.8. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 4–8 dGH. Regular testing will ensure conditions stay within this range.
Water care products
We may earn from qualifying purchases
Tank Setup
To house Allen's Rainbowfish and Apistogramma Mouthbrooder (Maulbrüter) together, plan for an aquarium of at least 150 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 - lighly covered, Driftwood (Digestion/Hiding), Sand (Sifters), Leaf Litter/Blackwater. 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 Allen's Rainbowfish and Apistogramma Mouthbrooder (Maulbrüter).
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
Feeding products to consider
We may earn from qualifying purchases
.webp?2026-04-25T14%3A35%3A38.022Z)
Frequently Asked Questions
Can Allen's Rainbowfish and Apistogramma Mouthbrooder (Maulbrüter) live together?
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 150 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do Allen's Rainbowfish and Apistogramma Mouthbrooder (Maulbrüter) need?
A minimum of 150 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 Allen's Rainbowfish and Apistogramma Mouthbrooder (Maulbrüter) 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 Allen's Rainbowfish or Apistogramma Mouthbrooder (Maulbrüter) aggressive?
Allen's Rainbowfish is peaceful (2/10) and Apistogramma Mouthbrooder (Maulbrüter) 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 Allen's Rainbowfish and Apistogramma Mouthbrooder (Maulbrüter) need?
Both species overlap in the 6–6.8 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
How do I manage Apistogramma Mouthbrooder (Maulbrüter)'s territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Apistogramma Mouthbrooder (Maulbrüter) 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.
Related Comparisons
Allen's Rainbowfish & Ajamaru Rainbowfish
·
Allen's Rainbowfish & Angfa Rainbowfish
·
Allen's Rainbowfish & Axelrod's Rainbowfish
·
Allen's Rainbowfish & Barred Rainbowfish
·
Allen's Rainbowfish & Batanta Rainbowfish
·
Allen's Rainbowfish & Bleher's Rainbowfish
·
Apistogramma Mouthbrooder (Maulbrüter) & Aequidens diadema (Diadem Cichlid)
·
Apistogramma Mouthbrooder (Maulbrüter) & Aequidens sp. Atabapo
·
Apistogramma Mouthbrooder (Maulbrüter) & Apistogramma Broad-banded
·
Apistogramma Mouthbrooder (Maulbrüter) & Apistogramma macmasteri
·
Apistogramma Mouthbrooder (Maulbrüter) & Apistogramma Mamoré
·
Apistogramma Mouthbrooder (Maulbrüter) & Apistogramma Orange-tail
·