Can Bleeding Heart Tetra and Cobalt Blue Zebra Live Together?
Bleeding Heart Tetra and Cobalt Blue Zebra 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 Bleeding Heart Tetra and Cobalt Blue Zebra?
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
Bleeding Heart Tetra is a peaceful species (2/10), while Cobalt Blue Zebra is semi-aggressive (8/10). This notable difference means Cobalt Blue Zebra may occasionally assert dominance over Bleeding Heart Tetra.
Large aggression gap (6 points) between Bleeding Heart Tetra and Cobalt Blue Zebra increases stress risk for the more peaceful fish.
Bleeding Heart Tetra and Cobalt Blue Zebra 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 Bleeding Heart Tetra (5.5–7.2) and Cobalt Blue Zebra (7.8–8.6) do not overlap, making it impossible to satisfy both species simultaneously.
For general hardness, the shared comfort zone is 10–15 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Bleeding Heart Tetra and Cobalt Blue Zebra together, plan for an aquarium of at least 200 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: Plants - Densely covered, Driftwood (Digestion/Hiding), Leaf Litter/Blackwater, Sand (Sifters). Meeting these requirements will help both species thrive.
Note a potential conflict in setup requirements: Cobalt Blue Zebra is a plant destroyer, which conflicts with Bleeding Heart Tetra's requirement for live plants. Compromise where possible or prioritise the more critical need.
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
Bleeding Heart Tetra and Cobalt Blue Zebra 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 Bleeding Heart Tetra and Cobalt Blue Zebra.
55 Gallon Standard
60 Gallon Breeder
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
Frequently Asked Questions
Can Bleeding Heart Tetra and Cobalt Blue Zebra live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Bleeding Heart Tetra and Cobalt Blue Zebra need?
A minimum of 200 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 Bleeding Heart Tetra and Cobalt Blue Zebra 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 Bleeding Heart Tetra or Cobalt Blue Zebra aggressive?
Bleeding Heart Tetra is peaceful (2/10) and Cobalt Blue Zebra is semi-aggressive (8/10). The gap in aggression levels means the calmer fish may experience stress from the more assertive one.
What pH do Bleeding Heart Tetra and Cobalt Blue Zebra need?
Their pH requirements do not overlap. Bleeding Heart Tetra prefers 5.5–7.2, while Cobalt Blue Zebra needs 7.8–8.6. This makes them incompatible in the same water chemistry.
Will Bleeding Heart Tetra nip Cobalt Blue Zebra's fins?
Bleeding Heart Tetra is a known fin nipper. If Cobalt Blue Zebra has long or flowing fins, there is a real risk of fin damage. Keeping Bleeding Heart Tetra in a larger group can help redirect nipping behaviour toward conspecifics.
How do I manage Cobalt Blue Zebra's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Cobalt Blue Zebra 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.
Shared setup supplies
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Guidarium Editorial Desk
Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.
- Last reviewed
- May 3, 2026
- Last updated
- May 3, 2026
- Issues or corrections?
- Contact the editorial team
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