Reef Casa Pico 6 Mark II — 6 Gallon All-in-One Ultra-Clear Glass Reef Aquarium - Reef Casa

The Reef Casa Pico 6 Mark II is an all-in-one 6-gallon (22-liter) pico reef aquarium designed for saltwater enthusiasts who want a mini-reef in a compact space. Its unique low-profile design, nowhere else to be found on the market, is only 7 inches high with a 16" x 15" footprint. Made from 5mm rimless ultra-clear glass, the Pico 6 offers exceptional visual clarity of your marine ecosystem.

Why choose the Reef Casa Pico 6 Mark II

• All-in-one design: Integrated rear filtration with return pump, tubing, and directional nozzle included — no external plumbing required.
• Improved Mark II version: After two years of refinement, the Pico 6 has been redesigned for optimized filtration and even simpler maintenance.
• Rimless ultra-clear glass: 5mm ultra-clear front glass for maximum visibility of your corals and invertebrates.
• Unique low profile: Only 7 inches (178 mm) high, ideal for a desk, counter, or wherever space is limited.
• 24-month warranty: 24-month manufacturer's warranty on silicone and workmanship — the best warranty in the industry for a pico aquarium.

Box contents

• Reef Casa Pico 6 Mark II ultra-clear 5mm glass aquarium
• Return pump with hose and directional nozzle
• 1 pre-cut Reef Casa filter floss square
• 1 bag of high-purity activated carbon
• Self-leveling mat
• Integrated rear filtration

Technical specifications

• Display volume: 5.8 gallons / 22 liters
• Total system volume: 7.24 gallons / 27 liters
• Rear filter volume: 0.48 gallon / 1.83 liters
• Dimensions: 16" x 15" x 7" (405 x 380 x 178 mm)
• Rear filter width: 3" / 76.2 mm
• Return pump chamber: 3.9" x 3.14"
• Glass thickness: 5 mm ultra-clear
• Number of outlets: 1 directional nozzle
• Warranty: 24 months on silicone and workmanship

Installation and use in a reef aquarium

The Pico 6 Mark II is ready to install in minutes. The integrated rear filtration eliminates the need for an external sump or complex plumbing. Place the filter floss and activated carbon in the rear chambers, connect the return pump, and fill with saltwater. For optimal cycling, add Reef Casa Bacteria Hotel Blocks in the filtration chamber. Change the floss twice a week and the carbon every 1-2 weeks to maintain crystal clear water.

Reef compatibility

The Pico 6 is compatible with soft corals, LPS, zoanthids, and some SPS for experienced aquarists. It is also suitable for small fish like gobies, sexy shrimp (Thor amboinensis), and small anemones. Its low profile makes it an excellent choice for a tidal pool aquarium or a frag tank.

Why choose the Pico 6 at ReefSolution

ReefSolution is an authorized Reef Casa retailer in Quebec. Secure delivery throughout Canada. Free shipping available depending on order amount. Complete your pico reef system with compatible accessories available from us:

• Reef Casa Halo Reef LED — LED lighting with integrated timer and dimmer, full spectrum for all corals.
• Reef Casa Beam Reef LED — Compact silent lighting for soft corals and LPS, ideal for the Pico 6.
• Reef Casa Surf Mini Wave Maker 1600 GPH — DC wave pump for 4 to 25 gallon aquariums.
• Reef Casa Bacteria Hotel Blocks — Biofiltration blocks equivalent to 20 lbs of live rock in colonizable surface area.

Frequently Asked Questions

What lighting should I choose for a Reef Casa Pico 6?

The Reef Casa Beam is suitable for soft corals and LPS. To keep SPS or control the light spectrum, the Reef Casa Halo with integrated timer and dimmer is recommended. Both models include a gooseneck mount compatible with the Pico 6.

Is the Reef Casa Pico 6 a good reef aquarium for beginners?

Yes. Its all-in-one design with integrated filtration eliminates the complexity of an external sump system. However, a 6-gallon pico aquarium requires regular water changes (25% bi-weekly) because the small volume of water is less forgiving of parameter errors.

What is the difference between the Pico 6 and the Studio 12 from Reef Casa?

The Pico 6 is 7 inches high (ultra-low profile) with 6 gallons, while the Studio 12 is 11 inches high with 12 gallons and three filtration chambers. The Studio 12 offers more volume for fish and corals, but the Pico 6 is ideal as a desk aquarium or frag tank.