Cube 15 Mark II — All-in-One Nano Reef Tank 15 Gallon 5 mm Glass - Reef Casa

The Cube 15 Mark II is Reef Casa's all-in-one nano reef tank: filtration is built into the back of the tank, so there is no external plumbing and no sump to set up. A 16 x 15 inch footprint, 14 inches tall, 5 mm glass. Designed and manufactured in Canada.

How much water it actually holds

Reef Casa publishes the breakdown, and it is worth reading before you buy. The 15-gallon figure covers the whole system — not what you see out front.

• Total system volume: 15 gallons (56 L)
• Display tank volume: 12.8 gallons
• Rear filter volume: 2.2 gallons

12.8 + 2.2 = 15. The manufacturer's numbers add up. So that is 12.8 gallons in front of you and 2.2 gallons tucked behind the filter partition. Worth knowing when you dose additives and plan water changes: the total is the number that counts.

What comes in the box

• 1 Reef Casa filter floss square
• 1 bag of high purity activated carbon
• Return pump, hose and nozzle
• Built-in filter
• Self-levelling mat

Lighting, heater, powerhead and cabinet are sold separately.

Specifications

• System dimensions: 16" L x 15" W x 14" H (405 x 380 x 355 mm)
• Total volume: 15 gallons (56 L) — 12.8 gallons display, 2.2 gallons rear filter
• Front pane: ultra-clear glass, 5 mm
• Every pane is non-tempered, and the tank is drillable
• Rear filter width: 3" (76 mm)
• Return pump chamber: 3.9" x 3.14"
• Circulation: the return pump, its plumbing and the nozzle all ship with the tank — single outlet
• Height with the Halo light on its gooseneck: 20"
• Matching cabinet: 16" x 15" x 36" (405 x 380 x 914 mm)
• Manufacturer warranty: 24 months on silicone and workmanship

Something few nano reef tanks give you

Reef Casa states that the Cube 15 uses non-tempered glass throughout, and that it is drillable. That means if you ever want to drill the tank for a return line, a probe, or custom plumbing, you can. Drill a tempered panel and it shatters completely. Reef Casa leaves that door open for you.

The dry weight is not published

Reef Casa does not publish the empty weight of its aquariums, and we will not invent one. If you see a weight quoted somewhere else, it did not come from the manufacturer. If weight is a deciding factor for you — a wall shelf, transport, an upper-floor install — write to us with your exact constraint and we will weigh the unit in store before answering.

Rounding out your Cube 15

These are the options Reef Casa itself offers for this tank, and that we keep in stock:

• Reef Casa Halo Reef LED — 36 W full-spectrum LED with built-in timer and dimmer. On its gooseneck, it brings total height to 20".
• Reef Casa Nano Cabinet — 16" x 15" x 36", exactly the Cube 15 footprint. This is the stand the manufacturer pairs with this tank.
• Reef Casa Bacteria Hotel Blocks — biomedia for the rear filter chamber, equivalent to 20 lb of live rock in colonizable surface area.
• Reef Casa Surf Mini — 1600 GPH DC powerhead for 4 to 25 gallon aquariums.

Why buy your Cube 15 at ReefSolution

We are an authorized Reef Casa dealer. Our team in Laval builds these tanks and can walk you through lighting, flow and cycling. Secure shipping anywhere in Canada. Free shipping available depending on your order total.

Frequently asked questions

What is an all-in-one aquarium like the Cube 15?

It is a tank with the filtration built into the back, behind a partition. On the Cube 15 that chamber holds 2.2 gallons and measures 3 inches wide. Return pump, plumbing and nozzle are included, with a single outlet. No external plumbing and no sump under the stand.

Does the Cube 15 really hold 15 gallons of water?

Yes, but not all of it out front. Reef Casa publishes 15 gallons (56 L) for the full system: 12.8 gallons in the display and 2.2 gallons in the rear filter. For dosing and water changes, the 15 gallons is your working number.

Which cabinet fits the Cube 15?

The manufacturer specifies a 16" x 15" x 36" stand (405 x 380 x 914 mm) — that is the Reef Casa Nano Cabinet, which shares its footprint with the Pico 6 and the Studio 12.