Nyos OPUS G2 300 Pro-Line Aquarium (69 Gallons)

With its generous 69-gallon display volume and spacious filtration system, the OPUS G2 300 offers increased aquascaping flexibility and improved water stability, making it an outstanding choice for hobbyists looking to build a thriving reef ecosystem.

Crystal Clear Viewing with Ultra-Clear Glass

Every reef deserves uncompromised clarity. The OPUS G2 300 features premium ultra-clear low-iron glass on the front and both side panels to maximize light transmission while eliminating the green tint found in standard aquarium glass. Transparent silicone seams and precision-polished edges create a virtually invisible viewing experience that allows your corals and fish to take center stage.

The modern rimless design enhances the clean, contemporary appearance while providing panoramic viewing from multiple angles.

Hidden Overflow for a Cleaner Display

The OPUS G2 300 incorporates Nyos' signature Hidden Overflow design, positioning the overflow behind the rear glass instead of inside the display aquarium. This innovative design maximizes usable display space while maintaining an uninterrupted view of your aquascape.

Benefits include:

• More room for live rock and coral placement
• Unobstructed viewing without a bulky overflow box
• Improved aquascaping possibilities
• Excellent water circulation
• Clean, minimalist appearance

Pro-Line Cabinet Provides Maximum Storage

The Pro-Line cabinet extends beyond the aquarium footprint to provide significantly more storage space than conventional aquarium stands.

Premium features include:

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

The additional cabinet depth makes installation and maintenance considerably easier while providing ample room for today's advanced reef equipment.

Spacious Reef-Ready Sump System

The included glass sump is engineered specifically for high-performance reef aquariums and accommodates virtually all modern filtration equipment.

Designed for:

• Protein skimmers
• Return pumps
• Filter socks
• Media reactors
• Aquarium heaters
• Auto top-off systems
• Dosing equipment
• Controller probes and accessories

A dedicated freshwater reservoir is integrated into the system for convenient automatic top-off operation.

Engineered for Long-Term Reef Success

The OPUS G2 300 is designed to provide exceptional stability, quiet performance, and simple maintenance.

Key advantages include:

• Larger water volume for increased system stability
• Spacious sump for improved equipment layout
• Quiet overflow operation
• Easy plumbing installation
• Outstanding accessibility for maintenance
• Premium German engineering throughout

Whether you're building an SPS-dominated reef, a colorful mixed reef, or a stunning marine fish display, the OPUS G2 300 offers the space and flexibility needed for long-term success.

Premium Features

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

Technical Specifications

• Display Aquarium Dimensions: 35.4" L × 21.7" W × 20.9" H (90 × 55 × 53 cm)
• Display Volume: 262 Liters (69 Gallons)
• Glass Thickness: 10 mm Ultra-Clear Glass
• Cabinet Dimensions: 38.8" L × 25.8" W × 35.4" H (98.5 × 65.5 × 90 cm)
• Sump Dimensions: 20" L × 20" W × 13.8" H (50 × 49.5 × 35 cm)
• Sump Water Volume: Approximately 52 Liters (14 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 300 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