Can they live together?

Fancy Goldfish and Neon Tetra compatibility

Compare their preferred water conditions and basic behavior.

Fancy Goldfish

Fancy Goldfish

Neon Tetra

Neon Tetra

Not recommended

The recommended temperature ranges do not overlap.

  • Species-specific care guidance does not recommend this combination.

Checked for 1 Fancy Goldfish and 6 Neon Tetra in a 76 L aquarium.

Shared environment

Recommended temperature
No shared temperature range

Recommended pH
6.8 ~ 7.2

Suggested group sizes

Fancy Goldfish: at least 1

Neon Tetra: at least 6

Together they need at least 76 L and about 75 cm of length.

Check that your aquarium is large enough for both species.

Side by side

ItemFancy GoldfishNeon Tetra
Average adult sizeabout 20 cm (large)about 3 cm (small)
Recommended temperature18~21°C22~25°C
Recommended pH6.8~7.86.0~7.2
Water hardnessMedium hardnessMedium hardness
Minimum aquarium76 L, about 75 cm long54 L, about 60 cm long
Group sizesingle is fineat least 6
TemperamentGentleGentle
Social behaviorCan be kept alone or in a groupShoaling fish
Swimming zonemiddle & bottommiddle
Activity levelModerateModerate
Waste levelVery highLow
With shrimpadults not recommended, babies not recommendedadults use caution, babies not recommended
Beginner level3/55/5

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Frequently asked questions

Can Fancy Goldfish and Neon Tetra live together?

Planner result: Not recommended. The recommended temperature ranges do not overlap. Species-specific care guidance does not recommend this combination.

What water conditions suit both Fancy Goldfish and Neon Tetra?

Their planner ranges do not overlap (Fancy Goldfish: 18~21°C, pH 6.8~7.8; Neon Tetra: 22~25°C, pH 6.0~7.2), so one of them would be kept outside its recommended range.

How big should an aquarium for Fancy Goldfish and Neon Tetra be?

At least 76 L and about 75 cm long, the larger of the two minimums (Fancy Goldfish: 76 L, Neon Tetra: 54 L). Group sizes add to the bioload, so bigger is safer.

How many Fancy Goldfish and Neon Tetra should I keep?

Fancy Goldfish: can be kept singly (can be kept alone or in a group). Neon Tetra: at least 6 (shoaling fish).

Do Fancy Goldfish and Neon Tetra have similar temperaments?

Fancy Goldfish is gentle and swims in the middle & bottom; Neon Tetra is gentle and swims in the middle. Activity: moderate vs moderate.

Sources & review

Each species' values are cross-checked against the references below and normalized into the planner's own ranges; the verdict comes from the planner's published rules. No text or images are copied.

Fancy Goldfish

Review confidence B on an A–C scale (A is highest); last reviewed 2026-10-07.

Neon Tetra

Review confidence A on an A–C scale (A is highest); last reviewed 2026-10-07.

How compatibility is checked

Try it in my aquarium

This is a guide. Individual behavior and aquarium conditions can change the outcome.