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The DOC skimmer removes protein compounds effectively from the water circuit, better than a bio-mechanical filter, which means that by removing proteins “before” bacterial decomposition, crystal-clear water is retained and a rise in nitrate and phosphate is reduced.

In practice it can be observed that the absorbed matter is torn off the air bubbles again by skimmers with a tall reaction chamber. For this reason, all TUNZE® DOC skimmers have very short reactors with a high air throughput .
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Tunze Doc Nano Protein Skimmer 9002
Tunze Doc Nano Protein Skimmer 9002
List Price: $189.99
Our Price: $152.01
You save $37.98!

Recommended for aquariums from 40 to 200 litres (10 to 52 US gal.) of salt water.

The “Nano” model series has been designed for the use in reef biotopes up to 200 litres (52 US gal.), and is gentle to the plankton in operation. The DOC Skimmer 9002 removes up to 80 per cent of organic waste matter, such as protein and cellulose, from the aquarium water. Very little space is required in the aquarium, and its handling is very easy.
Tunze Doc Protein Skimmer 9010
Tunze Doc Protein Skimmer 9010 - Up to 264 Gallons
List Price: $399.95
Our Price: $299.93
You save $100.02!

The DOC skimmers have been developed for an effective and modern protein skimming process in marine biotopes from 200 to 2,000 litres (52 to 528 US gal.). They stand out for their compact dimensions at the same time ensuring a high foam cup capacity, and producing a very high throughput on account of their air capacity of 650 or 1,300 l/h (171 or 343 US gal./h), depending on the model. They can be placed directly in the aquarium or in cabinet systems with a variable water level.
   
 
General information
Marine aquarium inhabitants produce waste substances, the quantity depends on the livestock and the feeding. By means of an effective skimming system, organic waste matter, the so-called DOCs (Dissolved Organic Carbons), can be removed. To mention but a few, these are substances such as proteins, cellulose, dead cell substances from bacterial and algae. In high concentration they are harmful for any aquarium biotope. The DOC skimmer removes these compounds effectively from the water circuit, better than a bio-mechanical filter, which means that by removing proteins “before” bacterial decomposition, crystal-clear water is retained and a rise in nitrate and phosphate is reduced.

It can be observed that when air bubbles are produced proteins are absorbed immediately. In practice it can be observed that the absorbed matter is torn off the air bubbles again by skimmers with a tall reaction chamber. For this reason, all TUNZE® DOC skimmers have very short reactors with a high air throughput .

Principle
In the skimmer, the TUNZE® Hydrofoamer produces a large quantity of a mixture of 50 per cent of water and 50 per cent of fine air bubbles. Each air bubble has an active surface which binds the electrically charged DOCs (Dissolved Organic Carbons). The air water mixture is immediately transported into the middle reactor area, producing a dense foamy mass. The upper zone of the reactor is used to settle this foamy mass laden with protein, which is then removed into a special foam cup or into the foam extraction pipe. The purified water returns into the aquarium without bubbles or into the filter. By means of a special nipple, ozone can be introduced into the system, thus improving the skimming process and at the same time removing any yellowing matter in the aquarium water.

How do you select the right DOC skimmer for a marine aquarium ?
The Comline / Master DOC skimmer with hydrofoamer has an open water circuit which can be controlled. Apart from the air output, the flow rate of the skimmer determines the output of the DOC skimmer. In addition, due its biotope composition, every marine aquarium has a different sensitivity with respect to the organic load. Based on a standard marine aquarium with soft corals, the data on the suitable skimmer size may differ in other biotopes. For this reason, the aquarium volumes recommended for the skimmer should be reduced in case of sensitive biotopes:

Low sensitivity
In soft coral aquariums with long-polyp corals and anemones, for example, the share in dissolved organic matter may be higher, sometimes it may even be vital. In this type of aquarium, the recommended aquarium volume can be used without deduction.

Medium sensitivity
A medium organic stability is usually found in mixed aquariums inhabited with soft and stone corals (LPS). Filter-feeding animals, sponges, et cetera, are found there frequently as well. For these aquariums, a reduction of about 40 per cent of the skimming capacity is calculated. A skimmer for 1,000 litres (264 USgal.) should thus be used for an aquarium of about 600 litres (159 USgal.) which has this kind of reef design.

High sensitivity
Aquariums with primarily small-polyp stony corals (SPS) require an especially high degree of purity. They should have no load of phosphates or nitrates worth mentioning. Good oxygen saturation and very clear water are the pre-requisites. Comline DOC skimmer is also often used as a “stand-alone” solution in these aquariums. This type of aquarium should be reduced by about 60 per cent in volume for the skimmer volume mentioned.

High sensitivity and high load
Hard coral aquariums with a high population of fish require an extremely high skimming capacity. The skimmer has to ensure the degree of purity for the hard corals at an above-average high fish load. If the Comline DOC skimmer has to operate as a “stand-alone” solution here, a high performance is required. This type of aquarium should be reduced by up to 70 per cent in volume for the skimmer volume mentioned.


Classic DOC skimmer
These skimmers operate according to the horizontal rotation principle and are driven by the Hydrofoamer. The entire skimmer operates on the basis of the so-called contact skimming method. For this reason, coarser particles in the size of plankton are not drawn in. This method of operation is very gentle so that no living plankton is drawn into the pump circuit. The extremely flat construction makes it the smallest skimmer in its performance class.

Low sensitivity
In soft coral aquariums with leather corals and anemones, for example, the share in dissolved organic matter may be higher, sometimes it may even be vital. In this type of aquarium, the recommended aquarium volume can be used without deduction.

High sensitivity
Aquariums with primarily small-polyp stony corals (SPS) require an especially high degree of purity. They should have no load of phosphates or nitrates worth mentioning. The Classic DOC skimmer should NOT be used as a “stand-alone” solution in these aquariums. This type of aquarium should be reduced by about 60 per cent in volume for the skimmer volume mentioned.

High sensitivity for breeding tanks with plankton
Stone coral aquariums or other breeding tanks with plankton food require an especially high degree of purity. Good oxygen saturation and very clear water are the pre-requisites. This type of aquarium should be reduced by about 70 per cent in volume for the skimmer volume mentioned.

Nano DOC skimmer
The “Nano” model series has been designed for the use in reef biotopes up to 200 litres (52 US gal.), and is gentle to the plankton in operation. Very little space is required in the aquarium, and its handling is very easy. On account of the high demands in stone coral aquariums, this skimmer should be used only in aquariums with about 50 - 100 litres (13 - 26 US gal.) of water. Mixed aquariums or soft coral aquariums up to 200 litres (52 US gal.) can be set up without any problems.