Aphyosemion gardneri – Steel Blue Killifish
 
The Steel Blue Killifish is a striking colour variant of Aphyosemion gardneri, known for its intense iridescent blue body, red spotting, and vibrant fin patterns. Hardy, colourful, and full of personality, this species is one of the most popular killifish for aquarium keepers. They adapt well to community tanks with peaceful species but truly shine in species-only or pair/trio setups.
 
Care Sheet
Scientific Name: Aphyosemion gardneri
Variant: Steel Blue
Origin: Nigeria, Cameroon (small streams & swampy forest pools)
Temperament: Peaceful but territorial with males
Adult Size: 5–6 cm
Life Expectancy: 2–3 years
Difficulty: Easy–Moderate
Minimum Tank Size: 30 litres (larger for groups)
 
Water Parameters:
Temperature: 22–26°C
pH: 6.0–7.5
Hardness: Soft to moderately hard
Water Flow: Low
Lighting: Low to moderate; enhances colours
 
Tank Setup:
Heavily planted tank with hiding spaces
Floating plants help mimic shaded native waters
Soft substrate, leaf litter optional
Tight-fitting lid essential — excellent jumpers
Best kept as pairs or trios (1 male : 2 females)
 
Feeding:
Carnivorous — prefers protein-rich foods:
Live or frozen brine shrimp
Daphnia
Bloodworms
Mosquito larvae
High-quality micro-pellets
 
Behaviour & Compatibility:
Peaceful but males can be territorial toward each other
Best with calm, non-nippy tankmates
Suitable community mates: rasboras, small tetras, peaceful dwarf corydoras
Avoid fin-nippers and boisterous fish
Stunning display fish in nano setups
 
Breeding:
Very easy to breed
Eggs deposited on plants, moss, or spawning mops
Remove parents to prevent egg predation
Eggs hatch in 2–3 weeks depending on temperature
Fry accept microworms and newly hatched brine shrimp