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The range of stones we offer is dedicated to aquascaping. Thus we carry specially textured stones, some of which may harden the water slightly. If they do we mention this in the product text.

Ryuoh or Seiryu (also known as Minilandschaft) stones are especially attractive for an aquascaped layout. With their rugged exterior they can easily be combined to make larger formations. The grey colour of Ryuoh and Seiryu evokes the image of rugged massive rock formations or mountains. This makes them highly suitable for Iwagumi layouts.

Ohko, also called Dragon Stone, is an argillaceous rock that does not influence the water hardness, and whose holey structure and warm earthen tones make it an eye-catcher for your aquascape that gives it a very natural impression.

Elephant Skin (or Seegebirge) stones are strongly textured and fit very well into an aquascaped layout. Their natural-looking surfaces make them ideal for larger rock compositions in your aquascape. These stones harden the water slightly, however, you can easily compensate for this effect by large water changes.

Black Pagoda is a very attractive brown to anthracite-colored stone. Smaller pieces are very rugged, larger ones have different layers, hence the name "pagoda". This rock also hardens the water slightly.

Manten stones have a rough texture and are optimal for an Iwagumi layout. Their various warm tones and their rugged, rough exterior make them look like large boulders.

Koke stones are of volcanic origin and have a rough texture. Moss grows very well on them and attaches itself soon. A large number of small to medium-sized Koke stones makes for an attractive stone complex, on which ferns, Anubias and mosses find a good foothold and add some green accents to the rock formations.

Unzan stones are made from lava rock. They are given the shape of mountains, and they come with planting pockets. The aquatic plants thus fit very neatly into the mountain landscapes designed with Unzan stones and make the layout look perfectly natural.

Decorative Stones for Your Aquarium and Aquascape

In aquascaping, stones are an important part of the hardscape, i.e. the solid decoration in an aquarium. There are very purist designs based on Japanese principles, called Iwagumi, which use only one type of stone and no driftwood in addition to aquatic plants. In our online shop, we offer many different types of stone that are suitable for use in aquariums. The price is usually per kilogram. To help you calculate the right amount of stones for setting up or designing an aquarium layout, we've written the article Choosing hardscape by weight in our Aquascaping Wiki. The calculation takes into account the individual weight and volume parameters of each type of stone.

In general, when choosing stones for an aquarium, you should distinguish between water-neutral and hardening stones. Types such as Lava, Dragon Stone (Ohko Stone) and Loa Rocks are considered water-neutral, as are most of the stone types offered by the manufacturer ADA. These include Manten Stones, Unzan, Koke, Sansui, Kei and Yamaya Stones. A small note on this: ADA stone types are offered in 25 kg packs, and we even offer Unzan Stones in our shop as individually photographed one-of-a-kind pieces.

Stone types that harden the aquarium water contain lime. These components can sometimes be seen as whitish veins in the stone. Hardening, i.e. an increase in general hardness, carbonate hardness and pH value, occurs mainly when a CO₂ system is used on the aquarium. Injecting the gas produces small amounts of carbonic acid, which continuously dissolves the lime from the rock. To counteract the hardening, we recommend regular, larger water changes with very soft or even fully demineralized water, or simply using non-hardening types of rock. This is especially advisable if you want to keep sensitive dwarf shrimp such as bee shrimp in your aquarium. They don't cope well with the fluctuations in water hardness that would inevitably occur during a water change.

Heavily rugged stone types in particular, which are popular in aquascaping for creating mountain-like structures, are often calcareous. These include Seiryu stones (Mini Landscape), but also Grey Rocks, Frodo Stones, Black Pagoda and Tsingy Rocks.

You can find a complete overview of all the types of stone you can buy online in our shop in the article "Hardscape" in the Aquascaping Wiki. All stone types are listed there and described separately as water-neutral and hardening types.

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