The Nothobranchius guentheri is one of the most popular and beginner-friendly annual killifish, loved for its bright red and turquoise-blue body, peaceful nature, and fascinating life cycle. Native to temporary pools in Tanzania, this species is adapted to seasonal habitats, completing its life cycle rapidly before the dry season.

Males are vividly colored, with a glowing metallic blue body, red speckles, and ornate fins, while females are subtler but essential in breeding programs. Growing to just 3–4cm, this species is a favorite for aquarists who want to explore killifish breeding, conservation, or simply enjoy a splash of vibrant color in a compact tank.

🐠 Key Features:

• Scientific Name: Nothobranchius guentheri

• Common Name: Guenther’s Killifish

• Size: 3–4cm

• Lifespan: 4–12 months (longer in cooler, stable tanks)

• Temperament: Peaceful and non-aggressive

• Difficulty Level: Beginner to Intermediate

• Origin: Tanzania (seasonal pools and floodplains)

• Ideal for species-only aquariums and breeding setups

🌊 Water Conditions

N. guentheri thrives in warm, soft water with low flow and shaded lighting—similar to their native, still floodwaters.

• Temperature: 22–26°C (72–79°F)

• pH: 6.0–7.2

• Hardness: 1–8 dGH

• Tank Size: 10 gallons or more

• Filtration: Sponge filter or low-flow filter

• Lighting: Low to moderate (floating plants recommended)

Using peat moss or coco fiber substrate replicates their natural environment and supports egg-laying.

🐟 Tank Mates

Due to their peaceful nature and short lifespan, N. guentheri is best kept in species-only tanks or with other gentle, slow-moving fish.

Best practices:

• Keep in pairs or trios (1 male + 2 females)

• Avoid fin-nippers or fast fish

• No shrimp or invertebrates that may be disturbed or eaten

They prefer low-stress, stable tanks where breeding behavior can occur naturally.

🍽️ Feeding Habits

Nothobranchius guentheri are micropredators and benefit from a high-protein diet to support fast growth and spawning.

Recommended foods:

• Live baby brine shrimp

• Daphnia, grindal worms

• Microworms or vinegar eels

• Frozen bloodworms or cyclops

• Soft, high-quality micro pellets (supplemental)

Feed 1–2 times daily in small, consistent amounts.

🧼 Care and Breeding Tips

N. guentheri is an excellent introduction to annual killifish breeding, as it is one of the easiest to spawn and raise.

✅ Breeding steps:

1. Provide a spawning container or layer of peat moss

2. Allow the fish to spawn for 1–3 weeks

3. Collect the peat and dry it slightly in a sealed bag

4. Incubate for 6–8 weeks at room temperature

5. Re-wet the peat in a shallow hatching tank

6. Feed fry with infusoria, then baby brine shrimp

Change 20–30% of water weekly and keep tanks securely covered, as killifish are prone to jumping.

🌿 Why Choose Nothobranchius guentheri?

Nothobranchius guentheri is the perfect balance of beauty, ease of care, and educational value. With its vivid coloration, peaceful temperament, and fascinating life cycle, it’s a great choice for both beginners and experienced aquarists looking to explore the world of annual killifish.

Discover the vibrant charm of Nothobranchius guentheri—start your killifish journey today!