Can Agassiz's Dwarf Cichlid and Rusty Cichlid Live Together?

Both Agassiz's Dwarf Cichlid and Rusty Cichlid are moderately assertive species with an aggression score of 5/10. Their matching temperaments mean neither fish is likely to dominate the other in a shared aquarium.

Agassiz's Dwarf Cichlid and Rusty Cichlid both frequent the Bottom (Substrate) region of the setup. This overlap can increase competition for space, so providing ample room and cover is important to keep both species comfortable.

Additional behavioural considerations to keep in mind: Hyperactive swimmers can stress shy, slow-moving species through constant motion. Two territorial species may clash over territory, especially in smaller tanks.

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.

The pH requirements of Agassiz's Dwarf Cichlid (4.5–7) and Rusty Cichlid (7.6–8.6) do not overlap, making it impossible to satisfy both species simultaneously.

Hardness requirements are incompatible: Agassiz's Dwarf Cichlid needs 1–8 dGH while Rusty Cichlid requires 10–25 dGH.

To house Agassiz's Dwarf Cichlid and Rusty Cichlid together, plan for an aquarium of at least 165 litres with a minimum length of 90 cm. This recommendation combines the stricter species minimums with a community-load allowance so the pairing has realistic long-term space and filtration headroom.

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), Leaf Litter/Blackwater, Driftwood (Digestion/Hiding), Plants - Densely covered, Established Algae (Otocinclus). Meeting these requirements will help both species thrive.

Note a potential conflict in setup requirements: Rusty Cichlid is a plant destroyer, which conflicts with Agassiz's Dwarf Cichlid'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.

Agassiz's Dwarf Cichlid and Rusty Cichlid are the kind of pair that can look acceptable in a shop but become a maintenance problem at home. The main risk is not a single number in the chart; it is the way incompatible behavior, water needs, or pressure on space compounds over time once both fish are established in the same tank.