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Welcome to MKS - Your marine aquarium professionals


We stock the complete range of products for marine aquariums, from aquarium computers to zeolite filters. Here you will find everything you need to adapt the design of your aquarium to the habitat and needs of the animals and to match their natural environment as closely as possible. We are also happy to advise you personally and in detail on all your wishes and questions relating to marine aquariums.

Our latest products



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 ARKA CORALSCAPER GEL Coral Glue
ARKA CORALSCAPER GEL Coral Glue
Coralscaper Gel is a specially developed gel-based superglue with a very high cyanoacrylate content for the fast and secure bonding of corals both in and out of water. Coralscaper Gel offers maximum adhesive strength and is free of all harmful substances. It cures quickly even underwater and is safe for your corals.Application: Apply a sufficient amount of Coralscaper Gel to the coral or coral frag to be glued and press it into the desired position for a few seconds.Maximum adhesive strength Very high cyanoacrylate content Easy to use High yield 100% free of harmful substances Curves quickly even underwater

Content: 0.006 kg (€983.33* / 1 kg)

€5.90*
 CaribSea LifeRock Flatz 9,07 kg
CaribSea LifeRock Flatz 9,07 kg
Shortened cycling - long-term stable microclimate Until now there was no alternative to the live rock. Then came the LifeRocks from CaribSea. Fossil aragonite rock with a bacterial coating that shortens the cycling even compared to live rock and creates a long-term stable microclimate. And all this without ecological concerns, with a lower nutrient load and an incredible freedom of design. CaribSea LifeRock Originals are left in the shape and size as they occur in nature. This unique variety of shapes means you will find exactly the stones you need for your individual reef construction. For example, the rocks can serve as a base, supplement or stabilize arches. Furthermore, you can combine the rocks with suitable composites to create your own creations and shapes.Each rock is unique - for individual construction The LifeRocks of CaribSea are aragonite rocks of fossil origin, which are extracted from dry reefs. Formed by nature, no stone is like the other. Every single one captivates by its very own character. This makes LifeRocks ideal for building spectacular and individual reef Aquariums.No destruction of ecosystems - for the protection of nature Even though few people say it out loud: the amount of live rock available on the market exceeds the amount that can be legally extracted. LifeRocks are extracted sustainably and guaranteed without destroying existing ecosystems. Therefore the use of CaribSea LifeRocks as an alternative to live rock is an active contribution to environmental protection.Microcosm inclusive - for an active ecosystem LifeRocks are coated with a reddish bacterial film. This gives them the appearance of live rock with a calcareous red algae coating. More importantly, however, LifeRocks become revitalized live rock through the bacterial coating. The biofilm, which consists of permanent stages of different bacterial strains, enables transport and storage in a dry state. Aquascaping also offers completely new design possibilities: You can fully concentrate on the construction without having to take care that the stones do not dry out. As soon as the LifeRocks have arrived in the water, they come to life. This makes them more than just a visual eye-catcher for fascinating reefs - they are a reef that lives and filters and offers invertebrates, corals and fish the optimal microclimate. The cycling period can even be shortened in comparison to live rock! And all this without any uninvited guests. This makes the LifeRocks of CaribSea not only optically an alternative to live rock, but also functional! No trace of chemicals - clean and safe for invertebrates, corals and fish The extraction of LifeRocks from fossil reefs makes them perfect not only on the outside. Their chemical and structural composition is also natural. LifeRocks are absolutely silicate-free and do not bring any other chemical surprises into the water. In comparison to live rock they also show a lower nutrient load!Optimal habitat conditions - for unique reef aquariums The aragonite rock has grown within a functioning ecosystem. The high macro- and microporosity has developed naturally and provides exactly the structure that microorganisms and invertebrates are used to and need from nature. This makes a stable, colourful and healthy ecosystem from microorganisms to shimmering fish a breeze!A helping hand to kick-start the process LifeRocks are pre-infused with bacteria that lay dormant until the rocks are placed in the aquarium, which allows for dry transportation and storage. Once activated, the bacteria work to bring the ammonia levels in the water down to zero. The result is a living, breathing reef that creates the perfect microclimate for marine life.Product information Available in a range of shapes and sizes, LifeRocks meet all your aquascaping needs. LifeRock Original, for example, is a versatile product that can be placed or stacked in simple and complex configurations for outstanding biological filtration. Shelf Rock and Arches enable you to create spectacular caves, ledges and arches, while Belize Branches mimic the look of stony reefs. The LifeRock Shapes, Arch, XL Arch, Mega Arch and MegaCave provide you and your animals with arches, rings and tunnels that optimally recreate natural Habitats. Life Rocks can even be broken up and added to a refugium, sump or overflow for extra filtration. CaribSea rocks are packed loosely in cardboard boxes. This means that in case of parcel shipment (e.g. DHL, UPS, FedEx, Hermes, etc.) the rocks may break or parts may chip off. This depends on how the shipping service provider handles the parcels. This is part of the shipping process for rocks and is therefore not a reason for complaint. If you do not want the rocks to be transported in this way, please order the rocks from your dealer with pallet shipping. This is more expensive, but ensures that the boxes are better secured during transport.

Content: 10 kg (€21.49* / 1 kg)

€214.90*
 Deltec PF 110 Calcium Reactor
Deltec PF 110 Calcium Reactor
PF 110 Technical DetailsAquarium size up to 1000 litersDimensions (LxWxH) 215x190x560 mmPump Deltec DCC 1 MF (24V)10-step ControllerPower consumption 4-14 WattContent granules 2,2 Kg Product DetailsWorks According to the fluidized bed methodOptimal mixing of the granulesGranules is not includedCan be operated inside or outside filter sumps Bedienungsanleitung Downloaden als PDF [150 Kb] Risikobewertung Deltec Innenabschaeumer Downloaden als PDF [340 Kb] Aquarium size: 0 bis 3000 Liter

€369.95*
 Maxspect Ozone Kit for MJ-SK800
Maxspect Ozone Kit for MJ-SK800
Maxspect Ozone Kit for MJ-SK800 The ozone kit must be used when the user wishes to use an ozone generator with the Maxspect Jump skimmer.The connection of the hose coming from the ozone generator or the CO2 reactor can be made via a Y. Alternatively, one of the hoses can be removed from the skimmer and the hose from the ozone generator or CO2 reactor can be connected directly (the hose used must be ozone resistant).

€18.95*
New
 NEWA Mechanical pre-filter CF75
NEWA Mechanical pre-filter CF75
NEWA Mechanical pre-filter CF75The original NEWA Mechanical Pre-filter for the Cobra Internal Filter is a mechanical pre-filter sponge that traps dirt particles, organic residues and suspended solids before they reach the biological and chemical filter stages — protecting these from premature clogging and significantly extending their service life.Unlike generic third-party sponges — often made from uncalibrated polyester foam, which is prone to deformation and structural collapse — the NEWA Mechanical Pre-filter is manufactured from high-density filter material with a calibrated pore structure: effective particle retention without compromising water flow, wash after wash.Its shape is manufactured to the nearest millimetre to fit the NEWA Cobra’s pre-filter housing, guaranteeing a perfect circumferential seal: no bypass of unfiltered water, no loss of efficiency. Washable and reusable. Replacement recommended every 3–6 months. NEWA original spare part. Made in Italy.

€2.95*
 Red Sea Aquarium inner downpipe RF XL425A R42234
Red Sea Aquarium inner downpipe RF XL425A R42234
Red Sea Aquarium inneres Fallrohr RF XL425A R42234Passend für: REEFER XL 425 V3A

€29.95*
 Red Sea Aquarium inner downpipe RF XL525 R42202A
Red Sea Aquarium inner downpipe RF XL525 R42202A
Red Sea Aquarium inneres Fallrohr RF XL525 R42202APassend für: REEFER XL 525 V3A

€29.95*
 Red Sea Aquarium overflow pipe RF XL425A R42233
Red Sea Aquarium overflow pipe RF XL425A R42233
Red Sea Aquarium Überlaufrohr RF XL425A R42233Passend für: REEFER XL 425 V3A

€15.95*
 Red Sea Aquarium overflow pipe RF XL525 R42225A
Red Sea Aquarium overflow pipe RF XL525 R42225A
Red Sea Aquarium Überlaufrohr RF XL525 R42225APassend für: REEFER XL 525 V3A

€21.95*
 Red Sea Aquarium overflow pipe RF-250V3/350V3/XL200 R42209
Red Sea Aquarium overflow pipe RF-250V3/350V3/XL200 R42209
Red Sea Aquarium Überlaufrohr RF-250V3/350V3/XL200 R42209Passend für: REEFER XL 200, REEFER  350, REEFER 350 V3, REEFER 250 V3A, REEFER 250, REEFER 250 V3

€20.95*

About us  MKS

We are also happy to advise you personally and in detail on all your wishes and questions relating to marine aquariums. From nano aquariums to individually planned systems according to your personal ideas and budget. The design should be adapted to the habitat and needs of the animals and correspond as closely as possible to their natural environment.

We can draw on almost 20 years of experience in all aspects of marine aquariums, with all their ups and downs. From planning and installation to regular care and maintenance of your saltwater aquarium, we are your competent service partner. Regular care is the elementary building block for a functioning saltwater aquarium. If your time no longer allows it, we are happy to be there for you. From short-term vacation replacement to regular maintenance, you can rely on us.

For the welfare of the animals, we therefore do not offer shipping. Of course we have a certificate of competence according to § 11 Animal Protection Act. Opening hours at any time by telephone arrangement. You are welcome to contact us about products from all well-known manufacturers.

If you are looking for an item that might be suitable for the mksshop range but cannot find it anywhere, please let us know. We will be happy to find a solution for you.

What our customers say

I needed some spare parts for my Red Sea ReefWave 25 pump and ordered them from Mr. Kraus. The shipment was packed the same day and I received it two days later. Everything was fine, I will certainly order here again.
Rouven M

I ordered a beautiful Giesemann T5 light from Marco to be shipped to me in Canada. Marco provided excellent pricing, customer service and communication. My light was delivered on time. I will definitely recommend him to anyone looking for quality products and services.
Tyson´s Beak Kanada

Excellent store with lots of material available. Secure online shopping and fast delivery times. Questions about any product can be easily asked by e-mail. I recommend
Miguel Trindade Henriques