Angelfish
Flooded forests of the Amazon basin
- Temperament
- Semi-aggressive
- Diet
- Omnivore
- pH
- 6–7.5
- Group
- 1+
- Typical price
- $8–30
Demo
Angelfish with cardinals
River Keep demo · Large, 55–75 gal · calm, like a pond or swamp · running 615 days · shared October 2026
A beautiful blackwater tank and a very common mistake: grown angelfish hunt small tetras.
The fish
× 3
Peaceful with each other, but the cardinal school keeps shrinking.
Cardinal tetra≈Cardinal tetra
Paracheirodon axelrodi
- Size
- 4 cm
- Temp
- 23–29°C
- Flow
- Calm
- From
- Blackwater stream
Cardinal tetra
Rio Negro and upper Orinoco, Brazil and Venezuela
- Temperament
- Peaceful
- Diet
- Omnivore
- pH
- 4.5–7
- Group
- 6+
- Typical price
- $3–7
× 20
Report
- Shared range 24–29°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.
- Angelfish will eat Cardinal tetra
An adult angelfish reaches 15 cm and eats any fish that fits in its mouth, even ones it grew up with.
- Stocking 63% of capacity
A rough estimate based on adult body size and tank volume.
- 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 Angelfish, Cardinal tetra is estimated or taken from the genus, not yet checked against a source.