Nyos Opus 300 G2 Aquarium and Cabinet

The NYOS ^® OPUS ^® G2 series are ready-to-use reef aquariums engineered for quality, functionality and aesthetics. Thoughtful details place the tank itself in the background so nothing distracts from the main attraction: the reef experience.

Key Features

• Hidden overflow with external downcomer flush to the rear pane for a clean look and extra aquascaping space
• Three sides in ultra-clear glass with transparent silicone for vivid, lifelike colors and clear edges
• Deep blue rear panel creating a realistic depth effect under lighting
• Pool-basin design without cross braces for an unobstructed view
• Large, functional technique sump with generous filter chamber and 5‑chamber principle
• PVC fixed piping for safety, durability, and space-saving installation
• Adjustable, quiet drain plus emergency overflow
• Separate XL refill tank designed to cover about a week of evaporation
• Made in the EU with improved sustainability aspects

Cabinet

Moisture-resistant carrier plates (EN 312) and a durable melamine resin coating deliver robust, scratch- and impact-resistant surfaces. Cabinets are lined with waterproof foam, feature an increased working height, and a push-to-open system for comfortable access. Two design lines are available to match your style—minimal, space-saving elegance or a more cubic look with added storage and premium hardware.

Technique Sump

• Clear PVC piping for quick, reliable setup
• Generous main chamber with a constant water level of approx. 21 cm for skimmers, media reactors or algae reactors
• Included nylon filter sock for longer service life
• 5‑chamber layout: settling, mechanical filtration, main filter chamber, optional bubble trap, return chamber (ideal for ATO sensor)

Aquascaping and Viewing Experience

Extra depth supports spectacular reef structures, while ultra-clear glass reduces green tint so fish and corals appear more contrasting and vibrant. The deep blue rear pane enhances the illusion of a natural underwater world.

Sustainability

Wood components come from verified legal sources per ISO 38200 and are produced in FSC ^® certified facilities. Panels include recycled material and co-products to help lower the carbon footprint.

From hidden overflow and silent operation to premium cabinetry and a thoughtfully engineered sump, this complete reef system delivers professional performance, easy maintenance, and timeless design—perfect for a stunning saltwater display at home or in the office.

ProLine

Aquarium:
Aquarium dimensions (L x W x H) 90x55x53 cm
Volume aquarium (gross) 262L
Ultra clear glass Windscreen and side windows left and right
glass thickness 10mm
Hidden overflow (no downcomer in the aquarium) Yes

Cabinet (Pro Line):
Cabinet dimensions:  98.5cm x 65.5cm x 90cm (38.8 x 25.8 x 35.4 in)
Colors available: White or basalt grey
Total height of aquarium with cabinet: 140 cm (4 ft 7 in)
Height-adjustable feet: Yes
Sand edge and front silicone seal concealed: Yes
Hinges: Premium 125° with soft-close
Moisture-resistant wood boards in accordance with EN 312: Yes

Sump:
Sump dimensions: (L x W x H) 50 x 50 x 35 cm (20 x 20 x 13.8 in)
Sump water level: approx. 21cm (8 in)
Sump volume (gross) at a water level of 21cm (8 in): 52 liters (14 gal)
Refill tank dimensions: (L x W x H) and volume (net) 12 x 42 x 50 cm, 22 liters (4.7 x 16.5 x 20 in, 6 gal)
Footprint (skimmer chamber): (L x W) 30 x 50 cm (11.8 x 20 in)
Footprint (return chamber): (L x W) 20 x 22 cm (7.9 x 8.7 in)

Emergency drain Yes
Recommended flow return pump 2.000 l/h (525 gph)
Adjustable valve on main drain Yes

SlimLine

Aquarium:
Aquarium dimensions (L x W x H) 90x55x53 cm
Volume aquarium (gross) 262L
Ultra clear glass Windscreen and side windows left and right
glass thickness 10mm
Hidden overflow (no downcomer in the aquarium) Yes

Cabinet (Slim Line):
Cabinet Dimensions: 90cm x 55cm x 90 cm (35.4 x 21.7 x 35.4 in)
Colors available: White or basalt grey
Total height of aquarium with cabinet: 143 cm (4 ft 8 in)
Height-adjustable feet: No
Sand edge and front silicone seal concealed: No
Hinges: Standard
Moisture-resistant wood boards in accordance with EN 312: Yes

Sump:
Sump dimensions: (L x W x H) 50 x 50 x 35 cm (20 x 20 x 13.8 in)
Sump water level: approx. 21cm (8 in)
Sump volume (gross) at a water level of 21cm (8 in): 52 liters (14 gal)
Refill tank dimensions: (L x W x H) and volume (net) 12 x 42 x 50 cm, 22 liters (4.7 x 16.5 x 20 in, 6 gal)
Footprint (skimmer chamber): (L x W) 30 x 50 cm (11.8 x 20 in)
Footprint (return chamber): (L x W) 20 x 22 cm (7.9 x 8.7 in)

Emergency drain Yes
Recommended flow return pump 2.000 l/h (525 gph)
Adjustable valve on main drain Yes