Description
Mantis Rubicon Aquarium 2.a – 40l — Compact all-in-one Starfire glass nano reef tank
A nano reef set-up usually means buying a tank, an overflow, a return pump and plumbing as separate purchases and then working out how they fit together, which is the gap an all-in-one tank is built to close. Mantis Rubicon Aquarium 2.a – 40l (SKU: MA069900) is the smaller model in the Mantis Rubicon series, a compact nano aquarium built in Starfire glass for a clearer, less green-tinted view than standard float glass. At 40 L it suits a desktop, a home office or a first reef set-up where a larger display would be impractical, and the series is aimed at hobbyists who want an easy-to-maintain tank without piecing a sump system together from separate parts.
The 40 L Rubicon ships with a glass overflow panel built into the tank itself, a circulation pump, the plumbing needed to connect the display to its filtration chamber, and a filter sock for mechanical filtration, so the core of a working reef system is included rather than left for the buyer to source. The overflow panel is what lets water drain to a filtration area behind or below the display while keeping the front glass clear of equipment, and the included pump returns filtered water back to the main display to complete the circuit. Because everything needed to start running the system is in the box, set-up is mainly a matter of positioning the tank, connecting the included plumbing and pump, and loading the filter sock before adding water. A larger 75 L Rubicon 4.a (SKU: MA069901) is built on the same principle for a bigger display.
Usage & Application
When to Use
- Desktop and office reef tanks: A 40 L footprint small enough for a home office or living space.
- First-time sump systems: An included overflow, pump and plumbing for a buyer new to all-in-one tanks.
- Clearer front-glass viewing: Starfire glass for less green tint than standard float glass.
- Nano reef or planted set-ups: A compact display suited to a smaller coral or planted layout.
Installation & Setup Guide
- Position the tank: Set it on a stand rated for its filled weight, levelled before adding water.
- Connect the plumbing: Fit the included plumbing between the display and the filtration chamber below the overflow.
- Fit the pump: Install the circulation pump to return filtered water to the main display.
- Load the filter sock: Fit the supplied filter sock before running water through the system for the first time.
Product Specifications & Highlights
Key Features
- Starfire glass construction: A clearer viewing pane than standard float glass.
- Built-in overflow panel: Drains to the filtration chamber while keeping the display free of visible equipment.
- Circulation pump included: Returns filtered water to the display without a separate purchase.
- Plumbing supplied: Connects the display and filtration chamber out of the box.
- Filter sock included: Mechanical filtration ready to run from day one.
Product Details
- Brand: Mantis
- SKU: MA069900
- Product Type: Saltwater Aquarium > All-in-One Nano Aquarium Kit
- Capacity: 40 L
- Glass Type: Starfire glass
- Included: Glass overflow panel, circulation pump, plumbing, filter sock
- Other Sizes: Rubicon Aquarium 4.a – 75l (SKU: MA069901)
- Target Environment: Marine (reef) aquariums


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