Blue Danio

Danio kerri

Blue Danio is a peaceful middle-to-top swimmer. Keep in a school of at least 10.

PeacefulMiddle to top swimmerKeep in a school of at least 10Beginner – Intermediate

Save this fish or add it directly to one of your aquariums.

Need help with Blue Danio?

Explore compatibility, care or problems using this guide and your aquarium’s conditions.

Quick facts

Adult size: ≤ 1.8" (≤ 4.5 cm)
Aquarium size: 30 US gal (112 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length
Care level: Beginner – Intermediate
Temperament: Peaceful
Swimming zone: Middle to top swimmer
Temperature: 64–77°F (18–25°C)
pH: 6.5–7.5
GH: 2–12 dGH
Diet: Omnivore
Lifespan: up to 5 years
Group behavior: Keep in a school of at least 10

Care requirements

Care level: Beginner – Intermediate.

Lifespan: up to 5 years.

Aquarium size and space needs

Minimum aquarium size: 30 US gal (112 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length. Plan the layout and stocking within that limit.

Water parameters

Suitable water: temperature 18–25 °C, pH 6.5–7.5, GH 2–12 dGH.

Temperament and compatibility

Blue Danio is peaceful and suits calm community fish.

Swimming zone and behavior

This fish uses the middle to upper part of the aquarium, so leave enough open swimming space for movement and feeding.

Feeding

As an omnivore, Blue Danio should receive a varied diet rather than one repeated food type.

Use appropriately sized prepared foods with regular small live or frozen invertebrates. Avoid torrent-like flow and cover every escape gap.

Before adding this fish

Plan for an aquarium of 30 US gal (112 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length.
Make room for its social group.
Avoid aggressive or highly competitive fish.
Keep in a school of at least 10.
Offer a varied diet suited to this species’ documented feeding habits.

Natural habitat and origin

Origin: Thailand.

Similar fish profiles

Use these profiles to compare fish with similar care level, size, temperature range, or swimming behavior.

Black Barred Danio Danio absconditus Same genus Same family Similar care level Beginner – Intermediate ≤ 2" (≤ 5.2 cm) 63–79°F (17–26°C) African Banded Barb Barbus fasciolatus Same family Similar care level Same temperament Beginner – Intermediate ≤ 2.4" (≤ 6 cm) 68–79°F (20–26°C) Bandula Barb Pethia bandula Same family Similar care level Same temperament Beginner – Intermediate ≤ 1.6" (≤ 4.1 cm) 72–79°F (22–26°C) Black Ink Barb Barbodes bunau Same family Similar care level Same temperament Beginner – Intermediate ≤ 2.4" (≤ 6 cm) 75–82°F (24–28°C) Black Ruby Barb Pethia nigrofasciata Same family Similar care level Same temperament Beginner ≤ 2.2" (≤ 5.5 cm) 68–81°F (20–27°C) Bleeding Blue Tetra Hyphessobrycon margitae Similar care level Same temperament Same swimming zone Beginner – Intermediate 1.6–2" (4–5 cm) 73–79°F (23–26°C)

FAQ

How large does Blue Danio get?

Blue Danio reaches ≤ 1.8" (≤ 4.5 cm).

What aquarium size does Blue Danio need?

Use an aquarium of at least 30 US gal (112 L) or larger / ≥ 31.5" (≥ 80 cm) minimum length.

Is Blue Danio peaceful?

Yes. Blue Danio is recorded as peaceful and is best planned with calm community fish that do not harass it or dominate the feeding area.

What temperature is suitable for Blue Danio?

Keep it between 18 to 25 °C.

Should Blue Danio be kept alone or in a group?

Blue Danio: Keep in a school of at least 10.