Hillstream loach
Sewellia lineolata
Fast mountain streams of central Vietnam · rapids
- Temperature
- 20–24°C
- pH
- 6.5–7.5
- Adult size
- 2.4 in · 6 cm
- Flow
- Strong
- Swims
- Bottom
- Temperament
- Peaceful
- Diet
- Grazer
- Group
- 3+
- Typical price
- $10–18
Photo: 5snake5, CC0
Demo
Hillstream river tank
Save the Little Fish demo · Medium, 30–40 gal · strong current, like a river or rapids · running 744 days · shared October 2026
A cool, fast stream: smooth stones, strong flow, lots of oxygen. Too cold for most tropical fish.
× 4
They graze the stones all day.
Zebra danio
Danio rerio
Streams and paddies of India and Bangladesh · stream
- Temperature
- 18–26°C
- pH
- 6.5–8
- Adult size
- 2 in · 5 cm
- Flow
- Strong
- Swims
- Top and mid-water
- Temperament
- Peaceful
- Diet
- Omnivore
- Group
- 6+
- Typical price
- $2–4
- Rarity
- Pet-store staple
Photo: Roundish, CC0
× 8
Love playing in the current.
White cloud mountain minnow
Tanichthys albonubes
Mountain streams near Guangzhou, China · stream
- Temperature
- 14–22°C
- pH
- 6–8
- Adult size
- 1.6 in · 4 cm
- Flow
- Gentle
- Swims
- Top and mid-water
- Temperament
- Peaceful
- Diet
- Omnivore
- Group
- 6+
- Typical price
- $2–4
- Rarity
- Pet-store staple
Photo: Ethmostigmus, CC BY-SA 4.0
× 8
Report
- Shared range 20–22°C
Every species is comfortable in this range.
- No hybrid risk
No two species here can cross, so any fry that turn up are pure.
- Stocking 57% of capacity
A rough estimate based on adult body size and tank volume.
- Fish at every level
Something at the top, in mid-water and on the bottom, so the whole tank looks alive.
- Add strong flow
Some of these fish come from fast rivers. Run a powerhead along the bottom for flow and oxygen.
- Tank size is a guess
Size and stocking checks use a typical tank of the size you picked. Add the real length and volume for a sharper answer.
- Some values are estimates
Care data for Hillstream loach, White cloud mountain minnow, Zebra danio is estimated or taken from the genus, not yet checked against a source.