Green Laser Corys

Green Laser Cory (Osteogaster sp. CW009)

Also known as Peru Green Stripe Cory or CW009

A peaceful and attractively marked armored catfish from the Upper Amazon basin in Peru (Marañón and Ucayali drainages). Known in the hobby by its CW code (CW009) and nicknamed the “Green Laser Cory” for its striking iridescent green lateral stripe, this species is a favorite among enthusiasts for its active shoaling behavior and subtle yet eye-catching patterning.

Key Features

• Maximum Size: Typically 5–6 cm / ~2–2.4 inches SL (genus standard).
• Appearance: Sturdy, armored body with a distinctive green iridescent stripe along the flanks that can appear laser-like under certain lighting. Juveniles often show an additional orange hue to the stripe. Females grow larger and more full-bodied than males; mature males develop slightly more pointed fin tips.
• Fin Details: Typical for the genus, with rounded to slightly pointed fins depending on sex and maturity.

Aquarium Care

• Tank Size: Minimum 20–30 gallons for a small group (larger is better for active shoaling).
• Water Parameters: Tropical freshwater; 72–82°F (22–28°C), pH 6.0–7.5, soft to moderately hard. Excellent water quality and a soft sand or fine-gravel substrate are essential to protect sensitive barbels.
• Diet: Omnivorous bottom feeder — readily accepts sinking tablets, granules, flakes, and a variety of live or frozen foods (bloodworm, white worm, daphnia, Tubifex).
• Behavior: Peaceful, sociable shoaling fish that thrives in groups. Excellent community tank inhabitant. Provide driftwood, plants, and open foraging areas with some shaded spots. Breeding reports exist in the hobby; females hold eggs between pelvic fins before depositing them on glass or décor.

IUCN Status Not Evaluated