Blue-Eyed Cardinalfish

Blue-Eyed Cardinalfish

Apogon leptacanthus

Also known as: Bluestreak Cardinalfish, Threadfin Cardinalfish

🧂 Saltwater ✌️ Peaceful 🟢 Easy 🥩 Carnivore Schooling (3+) Reef Safe

Translucent silvery body with vivid blue eyes and delicate elongated fins. A beautiful and peaceful schooling nano fish.

Tank Size

10 gal
minimum (20+ preferred)

Temperature

74–82°F
23–28°C

pH Range

8–8.4
water acidity

Max Size

2"
5.1 cm

Lifespan

3–5 years
typical in captivity

Swim Level

Middle
preferred zone

Care Notes

Best kept in groups of 5+. Very peaceful and shy. Nocturnal by nature — most active at dusk and dawn.

Feeding

Frozen mysis, cyclops, enriched brine shrimp, and marine pellets.

Compatible Tank Mates

Blue Green Chromis 3" Pink Skunk Clownfish 3.5" Skunk Clownfish 4" Orange Skunk Clownfish 4.5" Talbot's Damselfish 2.5" Lubbock's Fairy Wrasse 3" Melanurus Wrasse 5" Cleaner Wrasse 4" Yellow Coris Wrasse 5" Carpenter's Flasher Wrasse 3" Firefish Goby 3" Yellow Watchman Goby 4"

Use Caution With

Ocellaris Clownfish 3" True Percula Clownfish 3" Yellowtail Damselfish 2.5" Yellow Tang 8" Kole Tang 7" Clarkii Clownfish 5" Tomato Clownfish 5" Scopas Tang 8" Convict Tang 8" Azure Damselfish 2.5" Springer's Damselfish 2" Cinnamon Clownfish 5"

Incompatible With

Maroon Clownfish 6" Blue Devil Damselfish 3" Blue Tang 12" Powder Blue Tang 9" Naso Tang 18" Achilles Tang 10" Purple Tang 10" Three Stripe Damselfish 3" Domino Damselfish 5" Four Stripe Damselfish 3" Jewel Damselfish 6" Blonde Naso Tang 16"

Check Compatibility

Want to check if Blue-Eyed Cardinalfish is compatible with a specific fish? Use our compatibility checker to build your complete tank.