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

Ideal for reef hobbyists who want a larger display without the added depth of a traditional aquarium stand, the OPUS G2 300 Slim-Line provides an outstanding foundation for thriving SPS, LPS, mixed reef, and marine fish aquariums.

Crystal Clear Viewing with Ultra-Clear Glass

Showcase your reef with exceptional clarity using premium ultra-clear low-iron glass on the front and side panels. The low-iron glass eliminates the green tint associated with standard aquarium glass, allowing your corals, fish, and aquascaping to display their true colors under modern reef lighting.

Transparent silicone seams and precision-polished edges create an elegant, nearly invisible appearance that complements any contemporary living space.

The rimless design provides unobstructed viewing while emphasizing the clean, minimalist styling that defines the OPUS G2 series.

Hidden Overflow Creates More Display Space

The OPUS G2 300 Slim-Line features Nyos' innovative Hidden Overflow system, positioned behind the rear panel instead of inside the display aquarium. This design maximizes the usable display area while creating a cleaner, more natural appearance.

Benefits include:

• More room for aquascaping
• Increased coral placement options
• Unobstructed panoramic viewing
• Efficient surface skimming
• Quiet water circulation
• Modern minimalist aesthetics

The hidden overflow allows your aquascape—not bulky overflow boxes—to become the focal point of the aquarium.

Slim-Line Cabinet with Premium European Construction

The Slim-Line cabinet is engineered to provide premium construction while minimizing the overall footprint of the aquarium system.

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
• Excellent access for equipment and maintenance

Its slimmer profile makes the OPUS G2 300 Slim-Line an excellent choice for living rooms, offices, condominiums, and other installations where maximizing floor space is important.

Spacious Reef-Ready Sump System

The included glass sump is designed to accommodate today's most popular reef filtration equipment while maximizing usable space inside the Slim-Line cabinet.

The filtration system easily supports:

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

A dedicated freshwater reservoir provides convenient automatic top-off operation to help maintain stable salinity with minimal maintenance.

Engineered for Long-Term Reef Success

The OPUS G2 300 Slim-Line combines increased display volume with intelligent engineering to create an exceptionally stable reef aquarium system.

Advantages include:

• Larger water volume for improved stability
• Quiet overflow operation
• Spacious sump layout
• Easy plumbing installation
• Outstanding equipment accessibility
• Premium German engineering
• Designed for years of dependable reef keeping

Whether you're building a vibrant SPS reef, a colorful mixed reef aquarium, or an impressive marine fish display, the OPUS G2 300 Slim-Line provides the performance and flexibility serious hobbyists demand.

Premium Features

• Rimless ultra-clear low-iron glass aquarium
• Hidden rear overflow system
• Transparent silicone seams
• Precision-engineered PVC plumbing
• 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: 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: 35.4" L × 23.2" W × 35.4" H (90 × 59 × 90 cm)
• Sump Volume: Approximately 52 Liters (13.7 Gallons)
• ATO Reservoir Capacity: Approximately 20 Liters (5.3 Gallons)
• Recommended Return Pump: Approximately 2,000 LPH (525 GPH)

What's Included

Your Nyos OPUS® G2 300 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