Blue Kerri Emperor Tetra (Inpaichthys kerri) 2.3-2.5cm

Blue Kerri Emperor Tetra (Inpaichthys kerri) is a stunning and peaceful freshwater fish, ideal for community aquariums. 

Species Overview

• Scientific Name: Inpaichthys kerri
• Common Names: Blue Emperor Tetra, Royal Tetra, Purple Emperor Tetra
• Size: 2–4 cm (0.8–1.6 inches)
• Lifespan: 3–5 years
• Origin: Aripuanã River basin, Brazil

Tank Setup

• Tank Size: Minimum 20 gallons for a small school
• Schooling: Keep in groups of 8–10+ to reduce aggression and promote natural behavior
• Substrate: Dark sand or fine gravel
• Decor: Driftwood, leaf litter, and moderate planting
• Lighting: Dim to moderate; tannins or floating plants help diffuse light

Water Parameters

• Temperature: 24–28°C (75–82°F)
• pH: 5.5–7.5
• Hardness: Soft to moderately hard (4–12°dGH)
• Filtration: Gentle flow with good oxygenation; peat filtration can help mimic natural conditions

Diet

• Type: Omnivore
• Feeding:
  • High-quality flakes or micro pellets
  • Frozen/live foods: brine shrimp, daphnia, bloodworms
  • Occasional veggie treats: spirulina flakes, boiled cucumber or broccoli

Compatibility

• Temperament: Peaceful, slightly boisterous during feeding
• Tank Mates:
  • Corydoras
  • Pencilfish
  • Dwarf cichlids (Apistogramma, Mikrogeophagus)
  • Small Loricariids
  • Avoid slow eaters or large/aggressive fish

Sexing & Breeding

• Sex Differences:
  • Males: Blue adipose fin, slimmer, more colorful
  • Females: Red-orange adipose fin, rounder body
• Breeding: Spawning species; provide dense plants or spawning mops