Fluval Bio-Stratum Volcanic Aquarium Soil – Fine
Made from 100% natural, mineral-rich volcanic soil from Mount Aso in Japan and infused with beneficial nitrifying bacteria, Bio-Stratum is specifically formulated to provide immediate biological activity and maintain ideal conditions for a thriving planted aquarium. Characterized by its non-compacting 1 mm powder granules, Bio-Stratum allows plants with even the finest and most delicate roots to easily spread throughout the porous substrate while absorbing a powerful mix of nutrients, minerals and trace elements that promote explosive growth and overall health.
Key Features
- Promotes healthy plant development, vigorous growth and vibrant colors
- Infused with dormant beneficial nitrifying bacteria that, once in contact with water, become active and support nitrogen cycling
- Non-compacting 1 mm powder granules allow for excellent root penetration and nutrient absorption
| Specification | Detail |
|---|---|
| Soil Type | Volcanic soil |
| Origin | Mount Aso, Japan |
| Granule Size | 1 mm powder granules |
| Contains | Mineral-rich nutrients, trace elements, dormant nitrifying bacteria |
FAQ
Can Bio-Stratum be used in both freshwater and saltwater aquariums?
Bio-Stratum is designed for freshwater planted aquariums only and is not suitable for saltwater environments.
Does the soil require mixing with water before use?
No, the soil can be added directly to the aquarium. The dormant bacteria will become active once in contact with water.
How deep should I apply Bio-Stratum in my tank?
Apply a layer of 2 to 4 cm depending on plant type and tank size. For delicate root plants, a thinner layer may be sufficient.


Harry Abraham –
My aquarium plants have grown much faster since switching to Bio-Stratum. The roots spread easily and the colors are much more vibrant. The soil doesn’t compact and stays loose even after a few weeks.
Jessica Watson –
I’ve used other substrates before, but this one is the most effective. My stem plants are thriving and the bacteria seem to be working well. It’s easy to mix in and the texture is perfect for fine-rooted species.
Theresa Oliver –
The soil performs well and supports plant growth, though it may take a few weeks for the bacteria to fully activate. I noticed a slight change in water chemistry after a month, which I think is normal.
Madeleine Blake –
Great for beginners. The instructions are clear and the results are visible quickly. My anubias and java ferns are now growing stronger and healthier than before.