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The Azoo Oxygen Plus Biofilters allow you to cultivate nitrifying bacteria for necessary biological filtration. These Biofilters are great for fry aquariums and brine shrimp hatcheries because they prevent young fry and small organisms from being trapped in the filter media. Operates silently, creating numerous minute bubbles for increased oxygen flow. Requires an air pump and airline tubing, sold separately. For use in aquariums up to 65 gallons

The Azoo Oxygen Plus Biofilters allow you to cultivate nitrifying bacteria for necessary biological filtration. These Biofilters are great for fry aquariums and brine shrimp hatcheries because they prevent young fry and small organisms from being trapped in the filter media. Operates silently, creating numerous minute bubbles for increased oxygen flow. Requires an air pump and airline tubing, sold separately. For use in aquariums up to 25 gallons

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Bak-Pak 2: External, back-hanging protein skimmer and biological filtration unit. This filter incorporates desirable features like an easy-to-clean intake tube that is designed to prevent algae growth, as well as a new enclosed directional outflow that reduces splash and bubbles in the tank. Just hang the unit behind the aquarium, plug it in, and it goes to work. It's that simple Designed for tanks up to 60 gallons, but multiple units may be used successfully in larger aquariums. Measures 7-1/2" x 3" x 17-1/2" high.Bak-Pak 2R+ The Bak-Pak 2R+ is designed for use in reef tanks where low nitrate levels are desirable, so contains no Bio-Bale media. This unit utilizes the same efficient protein skimmer as the Bak-Pak 2, while incorporating a new bubble reducing flow pattern. Measures 7-1/2" x 3" x 17-1/2". (Pump included.)Dual Bak-Pak 2: This filter provides complete hang-on filtration that incorporates two protein skimmers, eliminating the need to use two regular Bak-Pak units. Includes a biological filtration chamber in the middle. The biological chamber utilizes CPR's Bio-Bale biological filter media to provide maximum surface area for beneficial bacteria to colonize. Simply hang on Bak-Pak Dual Pak on the back of an aquarium, plug in the rejuvenation venturi powerheads, and enjoy a worry-free operation 11-1/2" x 3-3/4" x 18" high, for aquariums up to 120 gallons.Additional Bio-Bales are also available in white, 1 gallon size.Bubble Trap and Pre-Skimmer sold separately.Downloadable Bak-Pak 2 Instructions PDF. Downloadable Bak-Pak 2R+ Instructions PDF. Downloadable Dual Bak-Pak 2 Instructions PDF. (All require Adobe Acrobat Reader 4.0 or later - get it here for free)

Bak-Pak 2: External, back-hanging protein skimmer and biological filtration unit. This filter incorporates desirable features like an easy-to-clean intake tube that is designed to prevent algae growth, as well as a new enclosed directional outflow that reduces splash and bubbles in the tank. Just hang the unit behind the aquarium, plug it in, and it goes to work. It's that simple Designed for tanks up to 60 gallons, but multiple units may be used successfully in larger aquariums. Measures 7-1/2" x 3" x 17-1/2" high.Bak-Pak 2R+ The Bak-Pak 2R+ is designed for use in reef tanks where low nitrate levels are desirable, so contains no Bio-Bale media. This unit utilizes the same efficient protein skimmer as the Bak-Pak 2, while incorporating a new bubble reducing flow pattern. Measures 7-1/2" x 3" x 17-1/2". (Pump included.)Dual Bak-Pak 2: This filter provides complete hang-on filtration that incorporates two protein skimmers, eliminating the need to use two regular Bak-Pak units. Includes a biological filtration chamber in the middle. The biological chamber utilizes CPR's Bio-Bale biological filter media to provide maximum surface area for beneficial bacteria to colonize. Simply hang on Bak-Pak Dual Pak on the back of an aquarium, plug in the rejuvenation venturi powerheads, and enjoy a worry-free operation 11-1/2" x 3-3/4" x 18" high, for aquariums up to 120 gallons.Additional Bio-Bales are also available in white, 1 gallon size.Bubble Trap and Pre-Skimmer sold separately.Downloadable Bak-Pak 2 Instructions PDF. Downloadable Bak-Pak 2R+ Instructions PDF. Downloadable Dual Bak-Pak 2 Instructions PDF. (All require Adobe Acrobat Reader 4.0 or later - get it here for free)

Bak-Pak 2: External, back-hanging protein skimmer and biological filtration unit. This filter incorporates desirable features like an easy-to-clean intake tube that is designed to prevent algae growth, as well as a new enclosed directional outflow that reduces splash and bubbles in the tank. Just hang the unit behind the aquarium, plug it in, and it goes to work. It's that simple Designed for tanks up to 60 gallons, but multiple units may be used successfully in larger aquariums. Measures 7-1/2" x 3" x 17-1/2" high.Bak-Pak 2R+ The Bak-Pak 2R+ is designed for use in reef tanks where low nitrate levels are desirable, so contains no Bio-Bale media. This unit utilizes the same efficient protein skimmer as the Bak-Pak 2, while incorporating a new bubble reducing flow pattern. Measures 7-1/2" x 3" x 17-1/2". (Pump included.)Dual Bak-Pak 2: This filter provides complete hang-on filtration that incorporates two protein skimmers, eliminating the need to use two regular Bak-Pak units. Includes a biological filtration chamber in the middle. The biological chamber utilizes CPR's Bio-Bale biological filter media to provide maximum surface area for beneficial bacteria to colonize. Simply hang on Bak-Pak Dual Pak on the back of an aquarium, plug in the rejuvenation venturi powerheads, and enjoy a worry-free operation 11-1/2" x 3-3/4" x 18" high, for aquariums up to 120 gallons.Additional Bio-Bales are also available in white, 1 gallon size.Bubble Trap and Pre-Skimmer sold separately.Downloadable Bak-Pak 2 Instructions PDF. Downloadable Bak-Pak 2R+ Instructions PDF. Downloadable Dual Bak-Pak 2 Instructions PDF. (All require Adobe Acrobat Reader 4.0 or later - get it here for free)

Bak-Pak 2: External, back-hanging protein skimmer and biological filtration unit. This filter incorporates desirable features like an easy-to-clean intake tube that is designed to prevent algae growth, as well as a new enclosed directional outflow that reduces splash and bubbles in the tank. Just hang the unit behind the aquarium, plug it in, and it goes to work. It's that simple Designed for tanks up to 60 gallons, but multiple units may be used successfully in larger aquariums. Measures 7-1/2" x 3" x 17-1/2" high.Bak-Pak 2R+ The Bak-Pak 2R+ is designed for use in reef tanks where low nitrate levels are desirable, so contains no Bio-Bale media. This unit utilizes the same efficient protein skimmer as the Bak-Pak 2, while incorporating a new bubble reducing flow pattern. Measures 7-1/2" x 3" x 17-1/2". (Pump included.)Dual Bak-Pak 2: This filter provides complete hang-on filtration that incorporates two protein skimmers, eliminating the need to use two regular Bak-Pak units. Includes a biological filtration chamber in the middle. The biological chamber utilizes CPR's Bio-Bale biological filter media to provide maximum surface area for beneficial bacteria to colonize. Simply hang on Bak-Pak Dual Pak on the back of an aquarium, plug in the rejuvenation venturi powerheads, and enjoy a worry-free operation 11-1/2" x 3-3/4" x 18" high, for aquariums up to 120 gallons.Additional Bio-Bales are also available in white, 1 gallon size.Bubble Trap and Pre-Skimmer sold separately.Downloadable Bak-Pak 2 Instructions PDF. Downloadable Bak-Pak 2R+ Instructions PDF. Downloadable Dual Bak-Pak 2 Instructions PDF. (All require Adobe Acrobat Reader 4.0 or later - get it here for free)

The Bubble Trap eliminates turbulence bubbles and micro-bubbles caused by additives and/or high organics in the tank. Attaches to the outlet elbow of the Bak-Pak 2. Measures 5" x 7" x 2". Black color.The Bak-Pak Pre-skimmer fits around the power head and skims water from the aquarium surface where wastes accumulate. The Pre-skimmer makes the Bak-Pak even more efficient Measures 5" x 8" x 2-1/2".Downloadable Bak-Pak Bubble Trap Instructions PDF. Downloadable Bak-Pak Pre-Skimmer Instructions PDF. (Both requires Adobe Acrobat Reader 4.0 or later - get it here for free)

The Bubble Trap eliminates turbulence bubbles and micro-bubbles caused by additives and/or high organics in the tank. Attaches to the outlet elbow of the Bak-Pak 2. Measures 5" x 7" x 2". Black color.The Bak-Pak Pre-skimmer fits around the power head and skims water from the aquarium surface where wastes accumulate. The Pre-skimmer makes the Bak-Pak even more efficient Measures 5" x 8" x 2-1/2".Downloadable Bak-Pak Bubble Trap Instructions PDF. Downloadable Bak-Pak Pre-Skimmer Instructions PDF. (Both requires Adobe Acrobat Reader 4.0 or later - get it here for free)

Berlin X2 protein skimmers for all marine aquariumsRe-designed protein skimmers boast efficient waste removalEasy-to-set-up skimmer for in-sump or hang-on installationRe-designed Berlin X2 Skimmers boast 50 percent performance improvement. Upgraded units remove even the smallest amount of waste materials thanks to their patented triple-Pass design. Berlin X2 Turbo features new, high efficiency pinwheel impeller for more super fine, waste removing bubbles. Hang-on kit comes standard for versatile installation. 10-5/8" x 6-3/8" x 22" high.For Fish-Only Aquariums Up ToFor Soft Coral Aquariums Up ToFor Hard Coral Aquariums Up ToX2 Turbo225 gallons125 gallons75 gallonsX2 Venturi150 gallons100 gallons50 gallons --->Features:Triple-Pass - Air bubbles are forced along a circuitous three-way route inside the reactor chamber, which maximizes the contact time between the air bubbles and water. The patented Air Return Skirt prevents air bubbles from escaping the skimmer with the water flow and re-entering the aquarium.FoamView - Patented window built into the side of the collection cup allows you to quickly and accurately evaluate foam production and adjust accordingly.Tangential Water Inlet - Causes turbulent flow and a swirling motion that increases the mixing action of the water and air bubbles.90 Reaction Chamber - The 90 offset between the inlet and outlet of the reaction chamber saves space and increases efficiency for in-sump use.Removable Collection Cup and all Internal Parts - Allows easy cleaning and maintenance.Optimal Compactness without compromising skimming efficiency - The Berlin X2 performs as well or better than skimmers twice its size.Ability to concentrate and remove even the smallest amounts of waste materials - The Berlin X2 shows skimming activity at waste levels where other models fail to work.Upgraded Features: Berlin X2 Turbo The height of the reaction chamber has been increased by 2" to get the most from the increased performance of the new, high e