Can Blind Cave Tetra and Pink Tailed Chalceus Live Together?
Keeping Blind Cave Tetra and Pink Tailed Chalceus together is possible but requires caution, though some care is needed. Provide a spacious tank of at least 250 litres with plenty of hiding spots to reduce stress. Monitor behaviour closely, especially during the first few weeks.
At a Glance
Can your tank handle Blind Cave Tetra and Pink Tailed Chalceus?
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.
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Behaviour & Temperament
Blind Cave Tetra is a generally mild-mannered species (4/10), while Pink Tailed Chalceus is moderately assertive (6/10). This modest difference means Pink Tailed Chalceus may occasionally assert dominance over Blind Cave Tetra.
In terms of spatial distribution, Blind Cave Tetra prefers the Middle (Open Water) and Bottom (Substrate) zones, whereas Pink Tailed Chalceus occupies the Top (Surface) zone. Because they use different levels of the water column, territorial disputes are less likely and the tank will appear more balanced.
Worth noting: Pink Tailed Chalceus is a known jumper, so a tight-fitting lid is essential.
To improve the chances of a peaceful coexistence in this community tank: Keep fin nippers in larger groups to distribute nipping behaviour among conspecifics rather than tank mates.
Water Parameters
The safe temperature window for both species falls between 23°C and 25°C. Aim for the midpoint of this range (around 24.0°C) for optimal comfort.
Both fish can tolerate a pH between 6.5 and 7.5. Maintaining a stable value within this band is more important than hitting an exact number.
For general hardness, the shared comfort zone is 8–15 dGH. Regular testing will ensure conditions stay within this range.
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Tank Setup
To house Blind Cave Tetra and Pink Tailed Chalceus together, plan for an aquarium of at least 250 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.
Because this pairing requires extra vigilance, include plenty of hiding spots — caves, driftwood, and dense plant clusters — so the less dominant fish can retreat when needed.
Specific environmental needs for this combination include: 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.
Suitable Tank Sizes
Standard aquarium sizes large enough for both Blind Cave Tetra and Pink Tailed Chalceus.
75 Gallon Standard
90 Gallon Standard
125 Gallon Standard
150 Gallon High
180 Gallon Standard
350 Liter (120cm Deep)
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Frequently Asked Questions
Can Blind Cave Tetra and Pink Tailed Chalceus live together?
They can coexist, but the pairing requires careful monitoring. Provide ample space (at least 250 litres), plenty of hiding spots, and watch for signs of stress or aggression.
What size tank do Blind Cave Tetra and Pink Tailed Chalceus need?
A minimum of 250 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 Blind Cave Tetra and Pink Tailed Chalceus together?
Keep the aquarium between 23°C and 25°C. A target of around 24.0°C sits comfortably within both species' preferred ranges.
Are Blind Cave Tetra or Pink Tailed Chalceus aggressive?
Blind Cave Tetra is generally mild-mannered (4/10) and Pink Tailed Chalceus is moderately assertive (6/10). Their similar temperaments generally lead to a peaceful coexistence.
What pH do Blind Cave Tetra and Pink Tailed Chalceus need?
Both species overlap in the 6.5–7.5 pH range. Consistency is key — avoid sudden swings, and test regularly to stay within this window.
Will Blind Cave Tetra nip Pink Tailed Chalceus's fins?
Blind Cave Tetra is a known fin nipper. If Pink Tailed Chalceus has long or flowing fins, there is a real risk of fin damage. Keeping Blind Cave Tetra in a larger group can help redirect nipping behaviour toward conspecifics.
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