Mono Argenteus (6cm) – a striking silver brackish-water fish with a diamond-shaped body and bold black stripes. Ideal for semi-brackish or marine aquariums.

The Mono Argenteus, commonly known as the Silver Mono or Silver Moony, is a beautiful, disc-shaped brackish fish admired for its shimmering silver body and bold black vertical stripes. At 6 cm when sold as a juvenile, this species can grow up to 18–25 cm (7–10 inches) as an adult, making it perfect for large aquariums or brackish community setups.

Known for its peaceful nature, striking appearance, and adaptability, the Mono Argenteus is a favorite among aquarists who appreciate exotic species that thrive in brackish or lightly marine environments.

✅ Key Features

• Size: 6 cm juvenile; adults reach up to 25 cm

• Temperament: Peaceful and schooling fish

• Care Level: Moderate (requires brackish water)

• Lifespan: 7–10 years with proper care

• Special Trait: Diamond-shaped body with reflective silver sheen and distinct stripes

Care Guide for Mono Argenteus

✅ Tank Requirements

• Minimum Tank Size: 200 liters (55 gallons) for a small group

• Aquascape: Provide open swimming areas with minimal decorations

• Lighting: Moderate to bright to enhance silver sheen

• Cover: Secure lid, as these fish are active jumpers

✅ Water Parameters

• Temperature: 24°C – 28°C (75°F – 82°F)

• pH Level: 7.5 – 8.5

• Water Hardness: 10 – 20 dGH

• Salinity: Brackish water (SG 1.005–1.015) increasing to marine conditions as they mature

• Filtration: Strong filtration with good water flow

• Water Changes: 25–30% weekly for optimal water quality

Note: Juveniles can tolerate freshwater temporarily but require brackish conditions for long-term health.

✅ Feeding Habits

Mono Argenteus are omnivorous and enjoy a varied diet.

• Recommended Diet:

  • High-quality flakes and pellets (suitable for brackish fish)

  • Frozen or live foods (brine shrimp, mysis shrimp, bloodworms)

  • Vegetable matter (blanched spinach, algae wafers)

Feed 2–3 times daily in small portions.

✅ Tank Mates

Monos are peaceful schooling fish and thrive best in groups of 4–6 or more.

Ideal Tank Mates:

• Scats

• Archerfish

• Puffers (peaceful species)

• Other brackish or marine-compatible fish

Avoid aggressive or very small species that may become prey.

✅ Behavior & Breeding

• Behavior: Active, social, and best kept in schools

• Breeding: Extremely rare in home aquariums; requires marine conditions and specialized care

Why Choose Mono Argenteus?

• Striking silver body with bold stripes

• Active schooling behavior that adds life to your tank

• Adaptable to brackish and marine setups

• Long-lived and hardy when cared for properly

✅ Perfect for brackish aquariums and large semi-marine community tanks
✅ A unique, eye-catching species for advanced aquarists