Can Black Skirt Tetra and Forktail Blue-eye Live Together?

🟢Ideal Tank Mates

Yes, Black Skirt Tetra and Forktail Blue-eye are ideal tank mates. Both species share compatible water parameters and peaceful temperaments, making them well-suited for a community aquarium. A minimum tank size of 66 litres is recommended.


At a Glance

Black Skirt Tetra

Gymnocorymbus ternetzi

Forktail Blue-eye

Pseudomugil furcatus

🐠Family Group
Black Skirt Tetra
Characins
Forktail Blue-eye
Rainbowfish
Temperament
Black Skirt Tetra
Mostly Peaceful (4/10)
Forktail Blue-eye
Peaceful (2/10)
Temperature
✓ Compatible
Black Skirt Tetra
20–26°C
Forktail Blue-eye
24–28°C
pH Range
✓ Compatible
Black Skirt Tetra
6–8
Forktail Blue-eye
7–8
Hardness (dGH)
✓ Compatible
Black Skirt Tetra
3–15
Forktail Blue-eye
5–15
Water Type
✓ Compatible
Black Skirt Tetra
Freshwater Only
Forktail Blue-eye
Freshwater Only
Flow Preference
✓ Compatible
Black Skirt Tetra
Moderate
Forktail Blue-eye
Moderate
Min Tank Volume
Combined: 66 L
Black Skirt Tetra
55 L
Forktail Blue-eye
55 L
Swimming Level
Shared: 1 zone
Black Skirt Tetra
Middle
Forktail Blue-eye
TopMiddle
🏷️Behavior Tags
Black Skirt Tetra
Hyperactive / Fast SwimmerFin Nipper
Forktail Blue-eye
Nano / Bite-sized (Predation Risk)Hyperactive / Fast SwimmerJumper (Lid Required)

Behaviour & Temperament

Black Skirt Tetra is a generally mild-mannered species (4/10), while Forktail Blue-eye is peaceful (2/10). This modest difference means Black Skirt Tetra may occasionally assert dominance over Forktail Blue-eye.

Black Skirt Tetra and Forktail Blue-eye 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: Forktail Blue-eye 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 26°C. Aim for the midpoint of this range (around 25.0°C) for optimal comfort.

Both fish can tolerate a pH between 7 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 5–15 dGH. Regular testing will ensure conditions stay within this range.

Tank Setup

To house Black Skirt Tetra and Forktail Blue-eye together, plan for an aquarium of at least 66 litres with a minimum length of 60 cm. This accounts for the larger species' space requirements with an additional 20 % buffer to reduce territorial tension.

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. 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.

Frequently Asked Questions

Can Black Skirt Tetra and Forktail Blue-eye live together?

Yes. Black Skirt Tetra and Forktail Blue-eye are considered ideal tank mates. Their water parameters, temperaments, and behaviour profiles are well matched for a community aquarium.

What size tank do Black Skirt Tetra and Forktail Blue-eye need?

A minimum of 66 litres (tank length at least 60 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 Black Skirt Tetra and Forktail Blue-eye together?

Keep the aquarium between 24°C and 26°C. A target of around 25.0°C sits comfortably within both species' preferred ranges.

Are Black Skirt Tetra or Forktail Blue-eye aggressive?

Black Skirt Tetra is generally mild-mannered (4/10) and Forktail Blue-eye is peaceful (2/10). Their similar temperaments generally lead to a peaceful coexistence.

What pH do Black Skirt Tetra and Forktail Blue-eye need?

Both species overlap in the 7–8 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.

Will Black Skirt Tetra nip Forktail Blue-eye's fins?

Black Skirt Tetra is a known fin nipper. If Forktail Blue-eye has long or flowing fins, there is a real risk of fin damage. Keeping Black Skirt Tetra in a larger group can help redirect nipping behaviour toward conspecifics.


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