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REEF CAVE 2 HOLES Reef Ceramics

  • 100% natural raw materials, no artificial additives
  • Biologically active after a short time    
  • Offers an optimal settlement area for beneficial bacteria
  • Non-toxic
  • Entirely handmade
  • Actively contributes to environmental protection
  • Made in Germany

Saltwater aquarium
Natural raw materials
Highly porous structure
Optimal settlement area

We manufacture our ARKA Aquatics reef ceramics completely by hand in our own production and from 100% natural raw materials. Therefore, each reef ceramic is unique, safe to use and ideally suited for unique reef structures in any marine aquarium. 

Thanks to their highly porous structure, our reef ceramics provide an optimal settlement area for useful bacteria in the aquarium, thereby creating the perfect basis for important biological processes – such as nitrification and denitrification – to flourish with maximum effectiveness. 

Thanks to the use of purely natural raw materials, our reef ceramics are free of pollutants.

FAQ Questions and answers

Our ARKA Aquatics reef ceramics do not necessarily have to be soaked before use, rinsing off the abrasion caused by transport is sufficient. However, if you have the time and opportunity to water, you can further minimize the silicate input that is never completely avoidable and normal with reef ceramics.

Place the reef ceramic in a suitable container (preferably food-safe) that does not release anything into the water and fill it with sufficient osmosis water. Use a flow pump to ensure a sufficient flow of water. Now add MICROBE-LIFT Sili-Out 2 silicate absorber in the filter bag supplied. As the ARKA Aquatics reef ceramic does not necessarily have to be watered, the duration of watering depends on the possibilities of each user. We recommend changing both the water and the MICROBE-LIFT Sili-Out 2 used after a few days.

We manufacture our ARKA reef ceramics in our own reef ceramic production at our company headquarters according to the highest quality standards.

Thanks to its highly porous structure, our ARKA reef ceramic is ideal as a settlement area for beneficial bacteria. Our reef ceramics can also be lightly and not extensively coated with our MICROBE-LIFT Gel Filter in order to further accelerate the biological activity.

We manufacture our ARKA reef ceramics completely by hand in our own production and from 100% natural raw materials. Therefore, each reef ceramic is unique, safe to use and ideally suited for unique reef structures in any marine aquarium. 

Our ARKA reef ceramics contain only natural raw materials, which ensure a uniquely porous structure that is ideal for beneficial bacteria. Our reef ceramics are therefore also free of harmful substances and ideally suited for any seawater aquarium.

Since reef ceramic matrix – like large parts of the earth's surface – consists of silicon and this reacts with oxygen to form silicate, a reef ceramic will always initially release some silicate into the water. 

However, this release is very low in our reef ceramics and can optionally be further reduced by soaking in combination with a silicate absorber (e.g. MICROBE-LIFT Sili-Out 2).

Since our ARKA reef ceramics are purely handcrafted reef ceramics and their size also changes slightly during the drying and firing process, all our dimensions given here are to be understood as approximate dimensions. Of course, the difference is within an acceptable range and not too big.

Does the ARKA Aquatics reef ceramics need to be watered?

Our reef ceramics do not necessarily need to be soaked before use. It’s sufficient to rinse them briefly to remove the abrasion caused by transport. 

If you still want to water the reef ceramic, we recommend placing it in a suitable container filled with osmosis water. Make sure there’s a good flow of water and add a suitable silicate absorber – for example using a filter bag. The water and absorber 
should be changed periodically – depending on the duration of the watering.


Can be optimally combined with

REEFSCAPER Reef Cement

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AQUA-FIX POLY-GLUE Underwater Adhesive

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AQUA-FIX POLY-GLUE Underwater Adhesive

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GEL FILTER Filter Starter

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SILI-OUT 2 Silicate Remover

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SPECIAL BLEND Water care bacteria

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NITE-OUT II Starter Bacteria

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