Waterbox Aquariums - MARINE EX 90.3
Overview
The Waterbox MARINE EX 90.3 delivers a premium saltwater aquarium experience with a design focused on aesthetics, functionality, and advanced filtration. Built for aquarists who want more internal space and optimal system performance, this external overflow system provides a sleek, rimless display, a robust sump setup, and marine-grade cabinetry to create a professional, high-clarity reefing environment.
Key Features
- External overflow for increased aquascaping space
- Ultra-clear low-iron glass with 91% light transmittance
- Precision plumbing system with safety drain and silent operation
- Durable aluminum-framed stand in Black, White, or Aspen
- Includes mesh-ready top frame (mesh lid sold separately)
- Integrated RO reservoir in sump
Display Aquarium
The 12mm ultra-clear glass provides a sharp, distortion-free view of your reef. High-strength black silicone reinforces durability while maintaining a clean finish. The external overflow sits behind the display - maximizing swimming room and aquascape design possibilities. A removable weir comb makes cleaning and maintenance simple.
Plumbing System
Designed for quick setup and quiet performance:
- Precision gate valve for silent tuning
- Safety drain and emergency overflow
- Dual directional return nozzles
- Quick-connect fittings for hassle-free installation
Sump System
The included acrylic sump provides a clean, functional space for advanced filtration:
- 4" filter sock chamber (roller-compatible)
- Spacious skimmer & media reactor chamber
- Return pump chamber fits most pumps
- Integrated RO reservoir supports most ATO systems
Cabinet Stand
The aluminum-framed cabinet is built for moisture resistance and long-term use. Laminated wood panels deliver a modern look, while adjustable leveling feet ensure stability. The open-back design supports easy routing of cords, hoses, and ventilation.
Specifications
Aquarium:
- Dimensions: 35.4" L x 19.7" W x 21.7" H
- Display Volume: 59.3 Gallons
- Total System Volume: 89 Gallons
- Glass Thickness: 12mm
- Total Height (with Cabinet): 57.1"
Sump:
- Dimensions: 31.5" L x 16.1" W x 15" H
- Sump Volume: 29.7 Gallons
- Acrylic Thickness: 5mm
- Skimmer Chamber: 15" x 11.9"
- Return Pump Chamber: 8.9" x 8.9"
- RO Reservoir: 8.9" x 6.3"
- RO Volume: 3.5 Gallons
Plumbing:
- Main Drain: DN25 (32mm)
- Emergency Overflow: DN25 (32mm)
- Return: DN20 (25mm)
- Return Nozzles: M20 (20mm)
Cabinet:
- Dimensions: 35.4" L x 19.7" W x 35.4" H
- Internal Dimensions: 32.4" x 17.6" x 32"
What's Included
- Waterbox MARINE EX 90.3 Aquarium
- Marine-Grade Aluminum Framed Cabinet
- Precision-Cut Acrylic Sump
- Full Plumbing Kit
- 225 Micron Felt Filter Sock
- Mesh Lid
- Sock Silencer
We totally understand that plans change! You can modify or cancel your order as long as it hasn’t been shipped yet. Just call or email us right away - our team will confirm if we can catch it before it leaves our facility.
If your order is already in transit, you’ll need to request a return once it arrives. Keep in mind that some items, like aquariums and livestock, can’t be returned.
For full terms, please refer to our Refund & Return Policy.
Placing an order is simple - just add your item to the cart & complete the checkout process online. Once your order is confirmed, we'll reach out to you directly to schedule a local pick-up appointment at our facility.
* All local pick-ups are by appointment only *
Order processing typically takes 1-2 business days for products that are in stock or readily available through our network of distributors. Some products, however, are fulfilled on demand directly from our distributors, which can slightly extend processing and delivery times depending on availability and location.
Rest assured - we always work to get your order shipped as quickly as possible.
If you’d like to confirm availability or request an ETA before placing your order, you’re always welcome to call or email us.