Kruger Meier Onyx Magma Stones 10-20 mm - Gravel for aquarium 2kg

Imagine an aquarium that not only looks beautiful but also functions like a well-designed ecosystem. Clean water, stable parameters, healthy fish, and lush plants – this is where it all begins. And this is what the layer, which... is not visible, is for.

Onyx Magma Stone is a porous volcanic rock that acts as a silent hero of the substrate. You place it at the bottom, under gravel or sand. This is where the magic begins:
- absorbing impurities,
- developing beneficial bacteria,
- naturally improving water quality.

This is not a decoration. It is an intelligent layer that makes a difference from the bottom up. If you want your aquarium to be not only beautiful but also stable and durable – start from the basics.

But if you like a raw, natural vibe – don’t worry. Onyx Magma Stone can also be used as a standalone substrate. Its dark color perfectly contrasts with the green of the plants and the colors of the fish, creating an effect of depth and elegance.

Why is it worth having it in your tank?
- Acts as a natural biological filter
- Porous structure – ideal for colonies of beneficial bacteria
- Reduces the risk of parameter fluctuations and blooms
- Helps maintain clear, clean water
- Supports fish health and the stability of the entire ecosystem
- It’s a solution you will appreciate over time – reliable, invisible, effective

Pro tip for you:
Place Onyx Magma Stone at the very bottom of the tank – under gravel or sand. Rinse it before use, as dust may accumulate during transport. And then... let nature do its work.