Can Redline Rasbora and Three-Spot Torpedo Hap Live Together?
Redline Rasbora and Three-Spot Torpedo Hap are not recommended as tank mates due to conflicting pH requirements and incompatible hardness ranges. Housing these species together is likely to result in stress, health problems, or direct harm to one or both fish.
At a Glance
Can your tank handle Redline Rasbora and Three-Spot Torpedo Hap?
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.
Behaviour & Temperament
Redline Rasbora is a peaceful species (1/10), while Three-Spot Torpedo Hap is moderately assertive (6/10). This notable difference means Three-Spot Torpedo Hap may occasionally assert dominance over Redline Rasbora.
Redline Rasbora and Three-Spot Torpedo 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.
Water Parameters
The safe temperature window for both species falls between 23°C and 27°C. Aim for the midpoint of this range (around 25.0°C) for optimal comfort.
The pH requirements of Redline Rasbora (4–6.8) and Three-Spot Torpedo 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 Three-Spot Torpedo Hap requires 10–25 dGH.
Tank Setup
To house Redline Rasbora and Three-Spot Torpedo Hap together, plan for an aquarium of at least 570 litres with a minimum length of 180 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). 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.
Why This Pairing Usually Fails in Practice
Redline Rasbora and Three-Spot Torpedo 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.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Redline Rasbora and Three-Spot Torpedo Hap.
Frequently Asked Questions
Can Redline Rasbora and Three-Spot Torpedo Hap live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Redline Rasbora and Three-Spot Torpedo Hap need?
A minimum of 570 litres (tank length at least 180 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 Redline Rasbora and Three-Spot Torpedo Hap together?
Keep the aquarium between 23°C and 27°C. A target of around 25.0°C sits comfortably within both species' preferred ranges.
Are Redline Rasbora or Three-Spot Torpedo Hap aggressive?
Redline Rasbora is peaceful (1/10) and Three-Spot Torpedo Hap 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 Redline Rasbora and Three-Spot Torpedo Hap need?
Their pH requirements do not overlap. Redline Rasbora prefers 4–6.8, while Three-Spot Torpedo Hap needs 7.5–8.6. This makes them incompatible in the same water chemistry.
How do I manage Three-Spot Torpedo Hap's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Three-Spot Torpedo Hap 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.
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 11, 2026
- Last updated
- May 11, 2026
- Issues or corrections?
- Contact the editorial team
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