Comline DOC Skimmer 9012 DC

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Why does BRS recommend this?

We have really liked the Tunze Comline skimmers due to their small form factor and their ability to adapt to many different systems. With AC pump and DC pump models available you can choose the skimmer that works best for your system.

Includes DC powered pump and controller for complete control.

Using the Tunze Flash Skimming Principle, the Comline DOC Skimmer pulls water through an efficient surface suction.

Heavy Bioload - 50 gallons

Medium Bioload - 150 gallons

Light Bioload - 260 gallons

  • Skimmer Cup volume: .7 Liters
  • Air capacity: 400 L/H (52 GPH)
  • Magnet holder for up to 1/2" thick glass
  • Quiet Operation
  • Bubble free outgoing water
  • Easy to remove collection cup
  • Immersion depth: approx. 255mm to 285mm (10 to 11 in.)
  • Power consumption: 13W, 230V/50Hz (115V/60Hz)
  • Dimensions: L140 x W110 x H415mm (L5.5 x W4.3 x H16.3 in.)


The 9012 DC Skimmer now includes a DC powered pump and controller for ultimate control and tuning ability.


The Tunze Comline DOC skimmer utilizes Tunze's "Flash Skimming" principle. The skimmer is quiet and generates a very large volume of small bubbles for efficient skimmer operation. It operates stand-alone without needing any additional equipment (feed pumps, etc) and mounts to the tank via a convenient magnet holder strong enough for glass up to 1/2" thick.


The TUNZE® Foamer generates large volumes of fine air bubbles with a diameter between .0039 to .011 in. (0.1 to 0.3 mm) On the surface of the air bubbles, pollutants such as protein, cellulose, dead cells, etc. are adsorbed immediately. The water/air mixture expands and stabilizes in the skimmer cup reactor, the water returns to the aquarium, and the protein-loaded air bubbles spill over into the skimmer cup. The patented anti-overfoaming system intermediate chamber prevents the skimmer from over foaming and controls the skimmer performance, depending on the water level and organic load. This “flash skimming” principle, compared to large skimmers with long contact time, is obtained because the substances adsorbed by the air bubbles are not released again, thus they don‘t return to the aquarium water.


Manual Owners Manual

More Information
Product Name Comline DOC Skimmer 9012 DC - Tunze
SKU 210060
UPC 781163795353
Maximum System Volume 201 - 300 Gallons
Recommended Tank Size 101 - 150 Gallons
Skimmer Body Types Hang In Tank
Variable Speed Yes
Control Type Digital DC Control (Controller Included)
Wattage 13W
Power Cord Length 9 Feet
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Product Questions

Will this fit in the sump of a JBJ 45 gallon rimless tank?
Question by: Daniel Davis on Mar 31, 2022, 6:15 PM
Below is the Tunze skimmer that will fit a JBJ 45 gallon aquarium.


Answer by: Rick Pucciarella (BRS Staff) on Apr 1, 2022, 12:04 PM
Can the magnets on the outside of the tunze doc skimmers be submerged in the water of the sump? The “outside wall” I want to put the skimmer is another chamber in the sump
Question by: Cammie on Mar 14, 2018, 5:37 PM
Yep, the magnets are submersible.
Answer by: Chad on Mar 19, 2018, 10:54 AM
Hi- can this skimmer go in a sump?
Question by: Melissa Merwin on Jun 4, 2017, 4:33 PM
Hi Melissa, The Tunze 9012 Skimmers can be placed in a sump. You will need to mount it close to the glass/acrylic in the sump so that the magnet can hold the skimmer at the proper water level.
Answer by: Charlie on Jun 5, 2017, 11:05 AM
which one of these skimmers from TUNZE may fit a IM Lagoon 50?
Question by: Byron G. on Nov 18, 2016, 8:45 AM
Hey there, thanks for reaching out to us! It doesn't look like these Tunze Comline skimmers will fit the Lagoon50. Their dimensions are larger than the Auqa Gadget SkimMate MidSize Ghost Skimmer -, which is the recommended skimmer for that tank. :-)

Answer by: Randy on Nov 18, 2016, 8:49 AM
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