Nyos OPUS G2 440 Slim-Line Aquarium (100 Gallons)

Whether you're creating an SPS-dominated reef, a vibrant mixed reef aquarium, or an impressive marine fish display, the OPUS G2 440 Slim-Line provides the stability, filtration capacity, and elegant aesthetics required for long-term reef-keeping success.

Crystal Clear Viewing with Ultra-Clear Glass

The OPUS G2 440 Slim-Line features premium ultra-clear low-iron glass on the front and side panels, delivering exceptional clarity and color accuracy. Unlike standard aquarium glass, low-iron glass eliminates the green tint, allowing your corals, fish, and aquascape to display their true brilliance under modern LED reef lighting.

Transparent silicone seams and precision-polished edges provide a clean, nearly invisible appearance that enhances every viewing angle.

Its rimless construction creates a sophisticated, contemporary look that complements luxury homes, offices, and professional aquarium installations.

Hidden Overflow Maximizes Display Space

Nyos' exclusive Hidden Overflow system is integrated behind the rear panel, removing bulky overflow boxes from the display aquarium.

This innovative design provides:

• More room for aquascaping
• Increased coral placement options
• Uninterrupted panoramic viewing
• Excellent surface skimming
• Quiet, efficient water circulation
• Clean, minimalist aesthetics

The hidden overflow allows your reef to become the centerpiece while maximizing usable display space.

Slim-Line Cabinet with Premium European Construction

The Slim-Line cabinet offers exceptional strength and functionality while maintaining a reduced footprint compared to traditional aquarium stands.

Premium features include:

• Heavy-duty moisture-resistant construction
• Push-to-open cabinet doors
• Premium European soft-close hinges
• Adjustable leveling feet
• Furniture-quality finish available in White or Basalt Grey
• Efficient cable management
• Easy access for equipment installation and maintenance

Its streamlined profile makes the OPUS G2 440 Slim-Line ideal for hobbyists who want a large reef aquarium without sacrificing valuable floor space.

Large Reef-Ready Sump System

The included glass sump is designed specifically for high-performance reef filtration and provides ample space for today's premium reef equipment.

The filtration system accommodates:

• Large protein skimmers
• Return pumps
• Filter socks
• Aquarium heaters
• Media reactors
• Auto top-off systems
• Dosing equipment
• Aquarium controllers and probes

An integrated freshwater reservoir simplifies automatic top-off operation and helps maintain stable salinity for healthier corals and marine fish.

Engineered for Serious Reef Keeping

The OPUS G2 440 Slim-Line delivers outstanding water volume and intelligent engineering to support demanding reef aquariums.

Advantages include:

• Large 100-gallon display volume
• Exceptional water stability
• Quiet overflow operation
• Spacious sump filtration
• Easy plumbing installation
• Excellent equipment accessibility
• Premium German engineering
• Designed for years of dependable reef keeping

Whether you're housing delicate SPS corals, vibrant LPS corals, soft corals, or a diverse marine fish community, the OPUS G2 440 Slim-Line provides a premium platform for long-term reef success.

Premium Features

• Rimless ultra-clear low-iron glass aquarium
• Hidden rear overflow system
• Transparent silicone seams
• Precision-engineered PVC plumbing
• Large glass sump filtration system
• Integrated freshwater ATO reservoir
• Slim-Line premium aquarium cabinet
• Soft-close push-to-open cabinet doors
• Adjustable leveling feet
• Furniture-quality European construction
• Reef-ready plumbing system
• Modern minimalist design

Technical Specifications

• Display Aquarium Dimensions: 49.2" L × 21.7" W × 21.7" H (125 × 55 × 55 cm)
• Display Volume: 378 Liters (100 Gallons)
• Glass Thickness: 12 mm Ultra-Clear Glass
• Cabinet Dimensions: 49.2" L × 23.2" W × 35.4" H (125 × 59 × 90 cm)
• Sump Volume: Approximately 62 Liters (16.4 Gallons)
• ATO Reservoir Capacity: Approximately 22 Liters (5.8 Gallons)
• Recommended Return Pump: Approximately 2,000 LPH (525 GPH)

What's Included

Your Nyos OPUS® G2 440 Slim-Line Reef Aquarium System includes everything needed to build the foundation of a premium reef aquarium:

• Ultra-clear, rimless low-iron glass display aquarium
• Factory-installed Hidden Overflow System
• Precision PVC plumbing kit
• Glass sump filtration system
• Integrated freshwater auto top-off (ATO) reservoir
• Slim-Line premium aquarium cabinet
• Soft-close push-to-open cabinet doors
• Adjustable leveling feet
• Filter sock and filter sock holder
• All necessary bulkheads and plumbing fittings
• Installation hardware
• Manufacturer's installation instructions