Can Redline Rasbora and Ruby Green Hap Live Together?

Redline Rasbora is a peaceful species (1/10), while Ruby Green Hap is semi-aggressive (7/10). This notable difference means Ruby Green Hap may occasionally assert dominance over Redline Rasbora.

Large aggression gap (6 points) between Redline Rasbora and Ruby Green Hap increases stress risk for the more peaceful fish.

Redline Rasbora and Ruby Green Hap 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.

Additional behavioural considerations to keep in mind: Hyperactive swimmers can stress shy, slow-moving species through constant motion.

Worth noting: Redline Rasbora is a known jumper, so a tight-fitting lid is essential.

The safe temperature window for both species falls between 24°C and 27°C. Aim for the midpoint of this range (around 25.5°C) for optimal comfort.

The pH requirements of Redline Rasbora (4–6.8) and Ruby Green Hap (7.5–8.6) do not overlap, making it impossible to satisfy both species simultaneously.

Hardness requirements are incompatible: Redline Rasbora needs 1–8 dGH while Ruby Green Hap requires 10–20 dGH.

To house Redline Rasbora and Ruby Green Hap together, plan for an aquarium of at least 204 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), Plants - Densely covered, Plants - Floating, 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.

Redline Rasbora 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.