Peninsula 120 - Professional Reef Aquarium System (90 Gallons)

Neptunian Cube Peninsula 120 Aquarium System

• 90 Gallon Display Tank Volume
• Display Dimensions: 47.2" x 22.4" x 21.6"
• Includes Aquarium, Sump, ATO Reservoir, Plumbing, and More

The Neptunian Cube Peninsula 120 is a 119-gallon professional reef aquarium system featuring a three-sided viewing design that provides a clear view of the aquarium from multiple angles. With 90 gallons in the display and a 29-gallon sump, it is engineered for reef keepers who want uncompromising performance wrapped in a clean, modern peninsula layout.

Its 12mm (0.5") ultra-white super-clear glass provides outstanding structural integrity and edge-to-edge clarity, showcasing corals and livestock in their best light. The stand’s side panels are interchangeable, allowing you to position the aquarium’s overflow on either the left or right side depending on what works best for your space.

The Peninsula 120 arrives as a nearly complete system, featuring an integrated ATO reservoir, UPVC plumbing with gate and check valves, a probe holder, titanium hardware, and a water-resistant cabinet.

One-of-a-Kind Overflow Drain System

One of the most distinctive features of a Neptunian Cube aquarium is its ultra-low-profile overflow system. Unlike bulky internal overflow boxes that can take up valuable room inside the aquarium or external overflow boxes that force you to move the aquarium several inches away from the wall, Neptunian Cube's design keeps the overflow tight against the back of the tank, leaving more usable display space for your fish and corals. Better yet, the overflow is made from glass rather than acrylic or plastic, making it easier to clean and maintain over time.

How It Works

• A dedicated main drain is tuned with the included gate valve for quiet operation.
• A secondary drain serves as an emergency backup for added protection.
• Water then flows into a false-bottom chamber beneath the aquarium.
• The plumbing connections extend through the bottom of the aquarium for a clean installation.

The result is an overflow system that delivers the performance expected from a purpose-built reef aquarium while remaining barely noticeable inside the display.

A Sump Designed for Flexibility

The sump included with this system gives you the space and flexibility to set up your tank’s filtration around the needs of your aquarium.

Key Sump Features:

• Multiple chambers separate filtration such as a protein skimmer, refugium, and return pump.
• Adjustable-height baffles allow you to fine-tune water levels in the skimmer and refugium chambers.
• An integrated gravity-fed ATO reservoir keeps fresh top-off water conveniently stored within the stand.
• A built-in probe holder provides a clean location for aquarium controller probes.
• The accessible layout makes it easy to install, adjust, and maintain filtration equipment.

A return pump is not included, giving you the flexibility to select a pump that best meets your needs. This tank uses soft 25 mm tubing for the return pump connection, so for the easiest setup, select a return pump that has a 25 mm (1") barbed output fitting.

Specifications

System Volume

• Total System: 119 Gallons
• Display: 90 Gallons
• Sump: 29 Gallons
• ATO Reservoir: 2 Gallons

Dimensions

• Display Tank: 47.2" L x 22.4" W x 21.6" H
• Display Tank Glass Thickness: 0.5" (12 mm)
• Sump: 27.56" L x 16.93" W x 15.35" H
• Protein Skimmer Chamber: 9.41" x 16.29"
• Refugium Chamber: 8.74" x 8.27"
• Return Chamber: 8.78" x 5.63"

Plumbing

• Main Drain: 32 mm
• Return Plumbing: 25 mm
• Emergency Overflow: 25 mm

Stand

• Dimensions: 47.2" L x 22.4" W x 33.5" H
• Material: Aluminum and PVC

What's Included?

Peninsula 120 Aquarium

Aquarium Stand

Sump

ATO Reservoir

UPVC Plumbing (with gate and check valve)

Probe Holder