Red Sea Berlin X2 Venturi Protein Skimmer

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This item has been discontinued.

Red Sea

Collection Cup with built in foam-view window

Patented window built into the side of the skimmer neck allows for accurate real time evaluation of foam production.

The Triple-Pass Principle

Red Sea’s patented Triple-Pass maximizes the water air contact time inside the skimmer reaction chamber stripping the aquarium water for even the smallest traces of organic pollutants, while minimizing the external dimensions and footprint of the product. By forcing the water-air mixture along a circuitous route, the Berlin X2 achieves a total surface area equal to that of much larger conventional skimmers.


  • Highly efficient skimming action
  • Removes even the smallest traces of organic pollutants from aquarium water
  • Super compact design
  • Minimal loss of seawater
Venturi injector
  • NEW high air-flow injector design
  • Completely removable for easy maintenance
  • Max. water throughtput: 600 lph / 160 gph
  • Max. air throughtput: 200 lph / 50 gph
Hang-on-tank kit

Enables the Berlin X2 to be quickly and easily converted from in-sump to hang-on configuration, offering the user greater flexibility and customization possibilities. The hang-on-tank kits is comprised of quick-fit parts for user-friendly installation and maintenance.

Long term pollutant reduction

Tests have shown that over time the Berlin X2 is extremely effective in lowering the level of oxygen-consuming pollutants (COD/BOD) in the aquarium water.

How do we rate our skimmers?

The recommended aquarium volume ratings for the Berlin X2 have been calculated according the optimum turnover rate per aquarium type, as determined by laboratory test conducted at Red Sea. They are as follows:
  • Fish tank: 1 turnover/h
  • Soft Corals (LPS): 1.5-2 turnover/h
  • Hard Corals (SPS): 3-4 turnover/h

Manufacturer Info

With a dedicated team of scientists and other professionals, Red Sea is widely recognized as a leading innovator and manufacturer of quality products for aquarium hobbyists. Red Sea constantly strives to provide hobbyists of all levels with highly effective solution-driven products designed to make your fish-keeping experience as enjoyable and successful as possible.

The embodiment of Red Sea’s dedication to providing solutions for today’s reef-keepers is its range of MAX-NANO, MAX-E & MAX-S aquariums- The only choice for true Plug & Play™ coral reef aquariums, now featuring the very latest in LED lighting technology.

For advanced reef-keepers the Red Sea REEFER provides a great platform into which you can add your own selection of hardware. With its ultra-clear glass, ATO built-in, silent flow valve and superb quality of finish the REEFER sets the standard for those wishing to customize. REEFER is also available as a Deluxe version with LED lighting included.

Red Sea’s unique Reef Care Program (RCP) provides a comprehensive, safe and easy to use program for testing and supplementing within reef aquaria, and is perfectly complemented by Red Sea’s Coral Pro & Red Sea Salt’s, which has become the salt of choice for those seeking the very highest quality water quality for their coral reef aquariums. Both salts are made using a unique natural process which delivers unrivalled homogeneity and is perfect for delicate corals. Check your individual bucket of salt’s composition using Red Sea’s innovative new “MyBatch” software.

Whatever your aquatic needs, Red Sea delivers high quality innovative, solution based products.

jvk from San Diego, CA UNITED STATES


Experience Level: Intermediate


I have had the skimmer for a little over a year and I bought it to replace a cheap skimmer that I was using. The skimmer does a good job of skimming, however the pump sometimes freezes up on me. This in not from lack of maintenance, I regularly disassemble and clean the pump components. The motor is very noisy. I don't know if it is the way I have it mounted in the sump or not, but it hummms very loudly!!!

3 out of 3 found this review helpful

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Experience Level: Intermediate


I purchased the berlin x2 venturi skimmer less than a year ago and it has been a pain since I got it.It seems to be difficult to adjust just right,its very noisy,and after just 9 months of owning it the pump went out.I wouldnt recommend it to anyone.

3 out of 3 found this review helpful

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Experience Level: Beginner


The idea behind the berlin x2 is awesome, but very very hard to regulate the foam and water mixture. I do not recommend this for beginners. :(

20 out of 33 found this review helpful

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