Can Blue Dolphin (Hap) and Festivum Live Together?
Blue Dolphin (Hap) and Festivum 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 Blue Dolphin (Hap) and Festivum?
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
Blue Dolphin (Hap) is a moderately assertive species (5/10), while Festivum is generally mild-mannered (4/10). This modest difference means Blue Dolphin (Hap) may occasionally assert dominance over Festivum.
Blue Dolphin (Hap) and Festivum 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.
Worth noting: Festivum is a known jumper, so a tight-fitting lid is essential.
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 Blue Dolphin (Hap) (7.5–8.6) and Festivum (5.5–7.2) 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 Blue Dolphin (Hap) and Festivum together, plan for an aquarium of at least 475 litres with a minimum length of 150 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), Driftwood (Digestion/Hiding), Plants - Floating. 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
Blue Dolphin (Hap) and Festivum 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 Blue Dolphin (Hap) and Festivum.
Frequently Asked Questions
Can Blue Dolphin (Hap) and Festivum live together?
No. This combination is not recommended. Key incompatibilities — such as critical behavioural conflicts — make cohabitation unsafe.
What size tank do Blue Dolphin (Hap) and Festivum need?
A minimum of 475 litres (tank length at least 150 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 Blue Dolphin (Hap) and Festivum 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 Blue Dolphin (Hap) or Festivum aggressive?
Blue Dolphin (Hap) is moderately assertive (5/10) and Festivum is generally mild-mannered (4/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Blue Dolphin (Hap) and Festivum need?
Their pH requirements do not overlap. Blue Dolphin (Hap) prefers 7.5–8.6, while Festivum needs 5.5–7.2. This makes them incompatible in the same water chemistry.
How do I manage Festivum's territorial behaviour?
Provide line-of-sight breaks using rocks, driftwood, and dense planting. A larger tank gives Festivum 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 4, 2026
- Last updated
- May 4, 2026
- Issues or corrections?
- Contact the editorial team
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