Onyx Magma Stones 10–20 mm – Aquarium gravel, 2 kg
Porous volcanic substrate stone in 10–20 mm grain size, sold in 2 kg packs. Intended for aquarists who want…
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Find a productProduct description
Onyx Magma Stones is a porous volcanic rock for aquarium owners who want to add a functional layer beneath the visible substrate. It is placed on the bottom of the tank under gravel or sand, and it can also be used alone as a dark, natural-looking bottom layer.
Why it matters
- Porous structure with a 10–20 mm grain size, which provides surface area for colonies of beneficial bacteria, according to the manufacturer.
- Positioned under gravel or sand, so it works in the base of the tank without changing the visible surface.
- The manufacturer states that it helps absorb contaminants and supports natural water quality.
- Dark colour contrasts with plant greenery and fish colours when used as a standalone substrate.
Specifications
- Brand: Kruger Meier
- Symbol: KM ONYX MAGMA STONES 10-20
- EAN: 5907059402104
- Grain size: 10–20 mm
- Material: porous volcanic rock
- Net weight: 2 kg
What it works with
This substrate is listed in the aquatic exotics category under substrates, decorations, rocks and plants. Use it as a base layer beneath gravel or sand, or as the sole substrate for a dark, rocky setup. Before placing it in the tank, rinse it thoroughly, because dust may be present after transport.
Technical specification
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Frequently asked questions
The supplier recommends laying it on the very bottom of the tank, under gravel or sand. It can also be used alone as a bare substrate if you prefer a raw, natural look.
Yes, rinse it before use, because some dust may appear during transport. Rinsing removes this dust before the stone goes into the water.
It is a porous volcanic rock with a grain size of 10 to 20 mm. The package contains 2 kg of stone.
According to the supplier, its porous structure gives beneficial bacteria a place to colonize, which can help with absorbing pollutants and keeping the water clear. These are the manufacturer's claims and are not independently verified in the product data.
The stone is dark in color, which the supplier says contrasts well with green plants and the colors of fish. It can be used as a standalone substrate or as a layer under gravel or sand.
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