Can Pacific Sturgeon and Three-Spot Torpedo Hap Live Together?
Pacific Sturgeon and Three-Spot Torpedo Hap are not recommended as tank mates due to no temperature overlap. 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 Pacific Sturgeon 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
Pacific Sturgeon is a generally mild-mannered species (3/10), while Three-Spot Torpedo Hap is moderately assertive (6/10). This modest difference means Three-Spot Torpedo Hap may occasionally assert dominance over Pacific Sturgeon.
Pacific Sturgeon and Three-Spot Torpedo Hap both frequent the Bottom (Substrate) 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
There is no temperature overlap between Pacific Sturgeon (10–22°C) and Three-Spot Torpedo Hap (23–28°C). This fundamental mismatch makes long-term cohabitation impractical.
Both fish can tolerate a pH between 7.5 and 8. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 10–20 dGH. Regular testing will ensure conditions stay within this range.
Tank Setup
To house Pacific Sturgeon and Three-Spot Torpedo Hap together, plan for an aquarium of at least 20000 litres with a minimum length of 600 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). Meeting these requirements will help both species thrive.
Both species do well with high (river/stream) water movement, so a standard filtration setup rated for the tank volume should suffice.
Why This Pairing Usually Fails in Practice
Pacific Sturgeon 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.
Frequently Asked Questions
Can Pacific Sturgeon and Three-Spot Torpedo Hap live together?
No. This combination is not recommended. Key incompatibilities — such as non-overlapping temperature ranges — make cohabitation unsafe.
What size tank do Pacific Sturgeon and Three-Spot Torpedo Hap need?
A minimum of 20000 litres (tank length at least 600 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 Pacific Sturgeon and Three-Spot Torpedo Hap together?
Unfortunately, there is no temperature range that satisfies both species. Pacific Sturgeon requires 10–22°C, while Three-Spot Torpedo Hap needs 23–28°C.
Are Pacific Sturgeon or Three-Spot Torpedo Hap aggressive?
Pacific Sturgeon is generally mild-mannered (3/10) and Three-Spot Torpedo Hap is moderately assertive (6/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Pacific Sturgeon and Three-Spot Torpedo Hap need?
Both species overlap in the 7.5–8 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
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 7, 2026
- Last updated
- May 7, 2026
- Issues or corrections?
- Contact the editorial team
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