Max Your Aquascape.
The first Waterbox Aquarium® built with an external overflow system. Maximizing internal space and giving full creativity to aquascaping.
MARINE EX 90.3
$2,799.00 USD
Building on the MARINE X platform, the MARINE EX line features a low-profile external overflow system paired with professional-grade acrylic sumps—delivering a sleeker display and an advanced filtration layout. Marine-grade cabinetry offers superior corrosion resistance, making the MARINE EX perfect for serious reef keepers seeking both functionality and sophistication.
What's Included
Technical Specifications
Dimensions: x x
Height with Cabinet:
Display Volume:
Total System Volume:
Glass Thickness:
For more detailed information click here.
Pairs well with
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QuickShip Aquariums
Don’t want to wait for your dream aquarium? With our QuickShip Aquariums, you won’t have to. These select systems are in stock and ready to leave our warehouse within 3–5 business days of your order.
That means your new Waterbox can be on its way to you in less than a week, so you can start building the aquarium you’ve always imagined—faster than ever before.
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Standard Aquarium Lead Times
All shipping timelines provided are estimates only and may vary based on overall demand, seasonal holidays, and logistics factors such as freight capacity or international cargo ship delays. Please note that shipping speeds are calculated in business days and do not include weekends or holidays.
While we work hard to meet or exceed our stated timeframes, unforeseen circumstances in transit may extend delivery windows. Rest assured, our team will keep you updated every step of the way and provide tracking details as soon as your order ships.
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Estimates Only*
All shipping timelines provided are estimates only and may vary based on overall demand, seasonal holidays, and logistics factors such as freight capacity or international cargo ship delays. Please note that shipping speeds are calculated in business days and do not include weekends or holidays.
While we work hard to meet or exceed our stated timeframes, unforeseen circumstances in transit may extend delivery windows. Rest assured, our team will keep you updated every step of the way and provide tracking details as soon as your order ships.
A closer look at the display.
Ultra-Clear Glass
Built with ultra-clear glass panels ranging from 10mm to 12mm thickness for maximum durability, each aquarium is precision-bonded with high strength silicone to ensure a secure, watertight seal that stands up to the immense pressure of a filled system.
External Overflow & Drain System
Engineered with an external overflow that relocates all plumbing to the back of the aquarium—maximizing internal display space for aquascaping while delivering a clean, unobstructed viewing experience.
Space-Saving Central Overflow
A centralized overflow with dual return system streamlines water management while maximizing internal display volume—giving you more room to design expansive, intricate aquascapes.
Custom-Fit Mesh Lid
Precision-designed for the MARINE EX, the included mesh lid provides a secure barrier to prevent fish from jumping while maintaining maximum light penetration and airflow for a healthy aquatic environment.
Easy To Assemble
Quick Connect
Our plumbing systems offer quick and easy assembly, while delivering high-performance results equivalent to those achieved through custom designs.
A closer look at the plumbing.
Pre-Engineered Quick Connect Fittings
Durable, high-quality quick connect fittings make plumbing assembly fast, secure, and tool-free. Saving you time and ensuring a leak-proof setup right out of the box.
Precision Overflow Valve
A high-performance gate valve on the main drain line lets you easily dial in and maintain a silent, balanced siphon for ultra-quiet operation and stable water levels.
Integrated Check Valve
A built-in check valve on the return line provides peace of mind by preventing backflow during pump shutdowns or power outages — protecting your sump from unexpected overflows.
All Acrylic Sump
Designed for the serious reefkeeper, the MARINE EX acrylic sump system redefines what advanced filtration should be—precise, efficient, and built to last.
A closer look at the sump.
Skimmer or Media Reactor Chamber
The spacious main chamber provides ample room for the industry’s leading protein skimmers and media reactors, giving you flexibility to choose the right equipment for your setup.
*Skimmer not included.
Filter Sock Filtration
Water first passes through dual felt filter socks that effectively remove debris and particulates. Each sock sits in a removable tray, allowing for quick maintenance or seamless conversion to a filter roller system for automated mechanical filtration.
Integrated RO Reservoir
In each sump is an Integrated freshwater reservoir, designed to hold RO/DI top-off water. This built-in feature maintains consistent water levels and salinity stability, helping your system remain balanced and reducing the need for frequent manual top-offs.
Strength and Durability
The MARINE EX stands on a marine-grade laminated cabinet that blends durability with contemporary design. Clean lines, adjustable leveling feet, and soft-close doors create a premium look and feel, while the spacious interior provides easy access to equipment and wiring.
A closer look at the cabinetry.
Available in Black, White, or Aspen
Choose from modern finishes that complement any home or office space—because your aquarium deserves a foundation as refined as the ecosystem it holds.
Adjustable Leveling Feet
High weight capacity adjustable leveling feet ensure your aquarium is level, front to back and side-to-side.
Stainless Hinges
Corrosion-resistant and durable, making them ideal for marine aquariums. They stand up to saltwater humidity, ensure smooth operation, and provide long-lasting reliability.
*Hinges might differ in appearance
3 Year Waterbox Warranty
Waterbox Aquariums® warrants your product against defects in materials and workmanship for a period of 3 years, valid from the original date of purchase.
The MARINE EX Series
