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Tunze Comline DOC Skimmer 9004

Tunze Comline DOC Skimmer 9004
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Tunze Comline DOC Skimmer 9004

100% Recommend this to a friend (4 of 4)

SKU: 208412
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Quick Overview

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

  • Up to 65 Gallon tank (Depending on tank load)

  • Skimmer Cup volume: .2 Liters

  • Air capacity: 40 GPH

  • Magnet holder for up to 3/8" thick glass

  • Quiet Operation

  • Bubble free outgoing water

  • Easy to remove collection cup

  • Immersion depth: approx. 225mm to 245mm (8.86 to 9.65 in.)

  • Power consumption: 4W, 230V/50Hz (115V/60Hz)

  • Dimensions: L110 x W90 x H305mm (L4.3 x W3.5 x H12 in.)

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Previously Asked Questions

  • by ViKo on July 10, 2014, @9:06 PM

    hey guys! im planning to set up a 60 gal reef tank with some nice corals, anemones and clown fish and others... i don't know which skimmer will fit best...

    Tunze Comline DOC Skimmer 9004 or Reef Octopus BH2000

    what would you guys recommend buying?

    thanks a lot


    Bulk Reef Supply Hi ViKo,
    If it is between these two skimmers my preference is for the Octopus. I really like the Tunze skimmer it just happens that the Octopus is rated for a much larger tank and when it comes to skimmers, I would always get the biggest one that fits in your budget and space constraints.

    Do you find this question helpful?  Yes   No

  • by Brian on April 27, 2014, @7:24 AM

    Will this fit in in the back of a Nuvo 16?

    Bulk Reef Supply Hi Brain,
    Unfortunately it would be too large to fit in the back of a Nuvo 16.

    Do you find this question helpful?  Yes   No

Full Details

The Tunze Comline DOC skimmer utlizes 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.


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4 Items

  • Great Skimmer By Greg on 3/26/2015

    I have been in the reefing hobby for approximately 15 years and have used numerous products for my tanks. Tunze products have always been great for me. I recently bought a Fusion 40g and after much research for different brand skimmers I again chose Tunze. The Tunze 9004 skimmer I purchased has been excellent. I have read a lot of reviews from others about how the skimmer is difficult to reassemble after cleaning. I have not had this problem but maybe I have been lucky. This skimmer does a great job and my tank looks excellent. I have however had to make some small adjustments to the air valve during it's break in period but once tuned it is perfect. The advertisement for this skimmer states that it can handle aquariums in the 65g range but have not tried it personally so can't comment whether it can or can't. I know that there are more expensive brands that can be used for my size tank but chose Tunze instead and am glad I did. This skimmer is compact, virtually quiet during operation, and has the ability to handle a decent bioload as well. Does that mean you can house ten or fifteen 4" fish in a 30 or 40g tank when using this skimmer? In my opinion no and I don't think it should be tried. With common sense, a sensible amount of livestock, and frequent water changes this skimmer In my opinion will do everything it is advertised to do. Happy reefing!
  • Great skimmer! By Cristina on 2/13/2015

    I have a Innovative Marine 39g tank. The space in the back of the tank designed for skimmer and other gadgets is very tight and pretty hard to find a good right size skimmer. I tried ,Innovative Marine ghost skimmer medium size (that is so little it went completely under water) , Hydor nano skimmer medium size (did a horrible job), CPR bak-pak skimmer (my original skimmer) which was ok but the pump kept breaking and it was sooooo loud! In the end I decided to go with this skimmer and man am I so glad. It is super quiet! It seams to be doing its job (just install it so can't give much review about how good of a job it is doing). I get no micro bubbles (some reviews were saying it does produce micro bubbles). The magnets I would say are not to strong which many do complain about but if you are careful then you can work it out very well. In all I absolutely LOVE IT! The best investment so far! I wish the collection cup was a bit bigger though but not a big deal, I guess I can empty it more often.
  • Works, but could be built better By DrexelLake on 12/12/2014

    I have the same complaint as many reviewing this online, and that is that it very flimsy and hard to get back together. The bubbles do come out all over too, but that doesn't make it less effective. Works great until you need to clean it. It took me 20 minutes to get the snaps to hold when putting it back together.
  • Great skimmer for small tanks By Clint on 4/11/2014

    I have been using this skimmer in a 20 L for about a year and have been very happy with it. It does not appear to be very sensitive to changes in water level, produces good skimmate, is easy to clean, stays in place with the magnets. If you are willing to sacrifice a little space (the skimmer sits inside of the tank) I think this is a great choice for tanks less than 30 gallons.

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