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X-ray tetra

Freshwater Beginner Peaceful

X-ray tetra grows to about 1.8 in and needs a tank of at least 15 US gal. Here's how to keep it healthy and what it lives well with.

Quick facts

Water type
Freshwater
Group
Tetras & rasboras
Difficulty
Beginner
Temperament
Peaceful
Swims
Middle
Adult size
1.8 in
Minimum tank
15 US gal
Min swim length
23.6 in
Group size
6+ together

Water parameters

Temperature
75–82 °F
pH
6–7.5
Hardness
3–12 dGH

Tank & care

X-ray tetra is a shoaling species — keep a group of at least 6 so they feel secure and show natural behavior. Kept alone or in twos they tend to turn shy, stressed or nippy.

Give it at least 23.6 in of swimming length and hold the water around 75–82 °F. Match any new species to these ranges before adding them.

Plan a tank with this fish

Use the stocking calculator to see how many X-ray tetra your tank can hold and whether your planned tankmates are compatible — it's anchored to your net water volume and footprint.

Open the stocking calculator Calculate tank volume

Figures are conservative hobby-consensus estimates for planning. Individual fish vary — always research a species and watch how yours behave.

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