Can Rio Negro Dwarf Cichlid and Ruby Green Hap Live Together?

Both Rio Negro Dwarf Cichlid and Ruby Green Hap are semi-aggressive species with an aggression score of 7/10. Their matching temperaments mean neither fish is likely to dominate the other in a shared aquarium.

Both Rio Negro Dwarf Cichlid and Ruby Green Hap are highly aggressive, increasing the risk of violent confrontations.

Rio Negro Dwarf Cichlid and Ruby Green Hap both frequent the Bottom (Substrate) and 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.

Additional behavioural considerations to keep in mind: 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 Rio Negro Dwarf Cichlid (4–6.5) and Ruby Green Hap (7.5–8.6) do not overlap, making it impossible to satisfy both species simultaneously.

Hardness requirements are incompatible: Rio Negro Dwarf Cichlid needs 0–5 dGH while Ruby Green Hap requires 10–20 dGH.

To house Rio Negro Dwarf Cichlid and Ruby Green Hap together, plan for an aquarium of at least 242 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: Leaf Litter/Blackwater, Driftwood (Digestion/Hiding), Sand (Sifters), Established Algae (Otocinclus). 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.

Rio Negro Dwarf Cichlid and Ruby Green Hap 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.