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Diamond tetra

Freshwater Beginner Peaceful

Diamond tetra grows to about 2.4 in and needs a tank of at least 20 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
2.4 in
Minimum tank
20 US gal
Min swim length
29.5 in
Group size
6+ together

Water parameters

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

Tank & care

Diamond 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 29.5 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 Diamond 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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