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Blue/Purple Emperor Tetra (Inpaichthys kerri)

Blue/Purple Emperor Tetra (Inpaichthys kerri)

Regular price $9.99
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The Blue/Purple Emperor Tetra is a striking shoaling fish that makes a stunning addition to any community aquarium. With its unique coloration and peaceful nature, it is an excellent choice for aquarists of all levels.


The Blue/Purple Emperor Tetra features a mostly cream-colored body accented by a bold horizontal black stripe and yellow-edged fins. Adult specimens exhibit a noticeable blue/purple sheen, especially during breeding displays. Females are generally smaller and plumper. This species breeds in pairs and thrives in shoals of at least 6 to 10 fish. Males may display competitive behavior, but this is not problematic in a spacious, well-decorated aquarium. Smaller shoals may lead to fin-nipping of other tank mates.


The Blue/Purple Emperor Tetra usually occupies the top and middle levels of the water column but can also be seen swimming and feeding at lower levels. They are compatible with other peaceful, small fish. Though they have a robust body compared to many smaller tetras, their mouths are very small. Adult dwarf shrimp may coexist with them, but the tetras might eat small shrimp and their fry. Larger, peaceful invertebrates can also be suitable tank mates. Being tank-raised, these tetras are adaptable, but they prefer soft, acidic water similar to their natural habitat, which is rich in tannins and leaf litter. They do not thrive in water with a pH above 7.0.


The Blue/Purple Emperor Tetra is not a picky eater and will thrive on a varied diet of meaty foods. High-quality flake food, pellets, and frozen or freeze-dried tubifex and bloodworms are all readily accepted. This varied diet helps maintain their vibrant coloration and overall health.


  • Elegant coloration, especially in males
  • Peaceful disposition with fish and peaceful invertebrates
  • Very active and noticeable fish in any aquarium
  • Hardy and adaptable
  • Fascinating shoaling behavior

Recommended Tank Parameters:

  • Temperature: 76° - 80° F (24° - 27° C)
  • pH: 5.5 - 7.0 (acidic water preferred)
  • KH: 4 - 8 dKH
  • Minimum tank size: 20 gallons for a school

Care Guidelines:

  • Diet: Omnivorous. Will easily accept high-quality dry and frozen foods.
  • Social behavior: Peaceful, schooling/shoaling.
  • Origin: Tank-bred, indigenous to South America
  • Average adult size: 1.4 inches (3.5 cm)
  • Average purchase size: 0.75 - 1 inch (1.9 - 2.5 cm)

Product photo is for reference only. Exact fish may vary in size and color.

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