Please, follow our recommendations to enjoy our boulders: 

  • Most of our Nano Boulders come completely clean. Even though, we recommend rinsing boulders with water before use to remove any remaining dust.

  • You can easily test if a boulder is inert or if it will change slightly the pH and hardness. Simply place few drops of vinegar on the rock. If the vinegar (a base substance) fizzes or foams, it indicates that the gravel contains some calcium.

  • Boulders that contain calcium may alter the pH and kH. This can be especially pronounced if you have acidic water or CO2 addition. You can easily control it by regular water changes with osmotic or soft water. You can also use a water softener.



Natural river nano boulders create a truly natural rolling stone riverbed impression. Elderly nano boulders have rich textures, stripes and have a cold colour pallet that will make any scape stunningly attractive and natural. You can play with the positioning of the different sizes of Elderly Nano Boulders combined with Elderly Boulders and Elderly Gravel to create depth in your aquarium.

You will get a stunning contrast by using Heaven sand.


Available in 2kg bags

*This is a highly sought after and extremely rare stone, supply is limited.

*This rock may raise pH and hardness slightly.

*Standard regular water changes are enough to keep the hardness under control.




Stunning vibrant pitch-black colour nano boulders, this rock fascinates for its smooth black-glazed surface, design possibilities are endless due to its excellent colour contrast and maze-like texture.  Black Venom Nano Boulders is a high-impact rock that magnifies the green of plants and moss. 

Mix and match with Black Venom Boulders and Heaven sand to achieve a high impact composition. 

Available in 2kg bags

*This rock may slightly raise water hardness.

*Standard regular water changes are enough to keep the hardness under control.

*An ideal stone for Iwagumi layouts.




The natural yellowish ochre nano boulder brings warmth to the nature scape. This nano boulder has beautiful smooth textures with rich warm palette tones that bring a new impression to the aquascaping world. You can create a perfectly harmonious scape by combining it with Bumblebee Boulders and Bumblebee gravels along with one of those sands: Bumblebee sand, El Dorado sand or Tigris sand.

Available in 2kg bags

*Does not affect water hardness. 




Impressively colourful Nano Boulders that will create a Monet like impression. The McDonald Lake Nano Boulder range in colour from dark red to maroon, and from green to blue. 


Lake McDonald is Glacier National Park's biggest lake in Montana, USA. One of the most striking features of this lake is the presence of a variety of coloured rocks and pebbles just below the water surface and on the shores. 

The coloured stones of lake McDonald are entirely the credit of the planet. The colour of the pebbles is due to the iron content in sedimentary pebble rocks and the degree of its oxidation. So, for example, where iron was in close contact with air, red colours prevail there. But green colours are typical for stones formed at great depths, where oxygen is very limited.

Initially, rocks were formed for millions of years and, depending on conditions, acquired those very amazing colours. Subsequently, these lake rocks were ground into small coloured pebbles by giant ice blocks during the Ice Age. Streams of meltwater brought coloured stones into the valley, which was filled with glacial runoffs.


Available in 2kg bags

*Does not affect water hardness. 



Our Inferno Nano boulders will bring a subtle colour to any display with their soft red-orange hues. These texture stones could be used to great effect in a biotope, especially for river displays or can be employed in a planted aquascape, where they will provide contrast to green plants and interest with their variegated patterns.


Available in 2kg bags

*Does not affect water hardness. 




A smaller version of our regular Druid Boulders, these stones, with their heavily textured surfaces and dark colouration could be used to great effect when combined with bright green plants such as Eleocharis. You might want to use them in a biotope, an aquascape or an emersed display! We think they wouldn’t look out of a place in a Studio Gibli animation, like dark boulders in a grassy meadow.

Available in 2kg bags

*Does not affect water hardness.