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

Designed for reef hobbyists who demand both beauty and functionality, this premium reef-ready aquarium system features Nyos' innovative Hidden Overflow, an oversized Pro-Line cabinet, and a spacious sump filtration system that accommodates today's most advanced aquarium equipment.

Crystal Clear Viewing with Ultra-Clear Glass

The OPUS G2 440 features premium ultra-clear low-iron glass on the front and both side panels for unmatched clarity and brilliant color reproduction. Unlike standard aquarium glass, low-iron glass eliminates the green tint, allowing your corals, fish, and aquascaping to appear exactly as nature intended.

Transparent silicone seams and precision-polished edges create an elegant, nearly invisible appearance that enhances every viewing angle.

The clean rimless design provides an open, contemporary aesthetic perfect for luxury homes, offices, and dedicated reef rooms.

Hidden Overflow for Maximum Aquascaping Space

Nyos' signature Hidden Overflow system places the overflow behind the rear panel rather than inside the display aquarium. This innovative design preserves valuable display space while creating an unobstructed viewing experience.

Benefits include:

• More room for live rock and coral placement
• Cleaner, uninterrupted viewing
• Improved aquascaping flexibility
• Efficient surface skimming
• Quiet, dependable operation
• Minimal visual distraction

Oversized Pro-Line Cabinet

The Pro-Line cabinet offers significantly more interior space than traditional aquarium stands while maintaining sleek European styling.

Premium cabinet features include:

• Heavy-duty moisture-resistant construction
• Push-to-open cabinet doors
• Premium 125° soft-close European hinges
• Adjustable leveling feet
• Concealed front silicone seam and sand line
• Furniture-quality finish available in White or Basalt Grey
• Extra-wide interior for controllers, dosing systems, reactors, and electrical equipment

The increased cabinet footprint makes maintenance easier while providing abundant room for organizing modern reef aquarium equipment.

Large Reef-Ready Sump System

The included glass sump is designed to support demanding reef aquarium filtration while providing excellent accessibility.

The spacious filtration chamber easily accommodates:

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

An integrated freshwater reservoir simplifies automatic top-off operation and helps maintain long-term salinity stability.

Engineered for Large Reef Aquariums

The OPUS G2 440 offers increased water volume and filtration capacity, providing greater stability for sensitive coral species and demanding marine livestock.

Key advantages include:

• Large 100-gallon display volume
• Outstanding aquascaping potential
• Excellent water stability
• Quiet overflow operation
• Spacious filtration layout
• Easy equipment installation
• Premium German engineering
• Designed for long-term reef success

Whether you're building a thriving SPS reef, a vibrant mixed reef aquarium, or an impressive marine fish display, the OPUS G2 440 delivers the performance serious reef keepers expect.

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
• Oversized Pro-Line cabinet
• Soft-close push-to-open cabinet doors
• Adjustable leveling feet
• Furniture-quality European construction
• Reef-ready plumbing
• 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: 52.6" L × 25.8" W × 35.4" H (133.5 × 65.5 × 90 cm)
• Sump Dimensions: 23.6" L × 20" W × 13.8" H (60 × 49.5 × 35 cm)
• Sump Water Volume: Approximately 62 Liters (16.4 Gallons)
• ATO Reservoir Capacity: Approximately 22 Liters (6 Gallons)
• Recommended Return Pump: Approximately 2,000 LPH (525 GPH)

What's Included

Your Nyos OPUS® G2 440 Pro-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
• Pro-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