Can Red Peacock (Ruby Red) and Rosy Finned Tetra Live Together?
Red Peacock (Ruby Red) and Rosy Finned Tetra are not recommended as tank mates due to conflicting pH requirements. 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 Red Peacock (Ruby Red) and Rosy Finned Tetra?
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
Red Peacock (Ruby Red) is a moderately assertive species (6/10), while Rosy Finned Tetra is peaceful (1/10). This notable difference means Red Peacock (Ruby Red) may occasionally assert dominance over Rosy Finned Tetra.
Red Peacock (Ruby Red) and Rosy Finned Tetra 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.
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.
The pH requirements of Red Peacock (Ruby Red) (7.8–8.6) and Rosy Finned Tetra (5.5–7.5) do not overlap, making it impossible to satisfy both species simultaneously.
For general hardness, the shared comfort zone is 10–12 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Red Peacock (Ruby Red) and Rosy Finned Tetra together, plan for an aquarium of at least 208 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.
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), Smooth Gravel (Sensitive Barbels), Plants - Densely covered, 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.
Why This Pairing Usually Fails in Practice
Red Peacock (Ruby Red) and Rosy Finned Tetra 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 Red Peacock (Ruby Red) and Rosy Finned Tetra.
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
Frequently Asked Questions
Can Red Peacock (Ruby Red) and Rosy Finned Tetra live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Red Peacock (Ruby Red) and Rosy Finned Tetra need?
A minimum of 208 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 Red Peacock (Ruby Red) and Rosy Finned Tetra 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 Red Peacock (Ruby Red) or Rosy Finned Tetra aggressive?
Red Peacock (Ruby Red) is moderately assertive (6/10) and Rosy Finned Tetra is peaceful (1/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Red Peacock (Ruby Red) and Rosy Finned Tetra need?
Their pH requirements do not overlap. Red Peacock (Ruby Red) prefers 7.8–8.6, while Rosy Finned Tetra needs 5.5–7.5. This makes them incompatible in the same water chemistry.
How do I manage Red Peacock (Ruby Red)'s territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Red Peacock (Ruby Red) 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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