Aquarium Gravel Sera Gravel British Brown 4–8 mm 10 kg

Sera Gravel British Brown 4–8 mm is a natural‑looking aquarium substrate supplied in a 10 kg bag and designed for freshwater tanks. The medium grain size creates a stable base for plants and decorations while contributing additional surface area for beneficial nitrifying bacteria. Its brown tones provide a neutral, natural backdrop that complements aquatic plants, rocks and driftwood and helps to visually unify tank layouts without influencing water chemistry.

Advantages

The 4–8 mm grain size balances stability and porosity: individual grains are large enough to prevent excessive compaction while small enough to support plant roots and allow water flow. The gravel’s natural brown coloration offers consistent aesthetics and conceals debris between cleanings. As an inert mineral substrate, it does not dissolve or alter pH and hardness under normal aquarium conditions. Packaged in a 10 kg bag, it is suitable for covering moderate areas or creating layered substrate zones.

Suitable for

• Freshwater community aquariums
• Planted tanks with root-feeding plants
• Tanks with rock and driftwood aquascapes
• Biological filtration support by providing surface area for bacteria

Key specifications

• Grain size: 4–8 mm
• Colour: British brown / natural brown tones
• Weight per bag: 10 kg
• Intended use: freshwater aquaria substrate
• Physical behaviour: inert mineral gravel, low soluble components

How to use

Rinse gravel thoroughly in running water until the rinse water is clear to remove dust and fines before adding to the aquarium. Spread an even layer across the tank floor; recommended depth is typically 2–4 cm for ornamental setups and deeper for planted aquaria where root penetration is required. Place heavier decorations and plants after substrate is positioned to avoid disturbing settled layers. When performing maintenance, use gentle gravel vacuuming to remove surface detritus without removing the entire substrate layer.

Usage recommendations

For planted tanks with demanding species, consider combining this gravel with nutrient‑rich substrate layers or root tabs to ensure long‑term plant nutrition. When establishing a new aquarium, cycle the tank before adding sensitive fish and monitor water parameters after setup. Avoid mixing with substrates that actively change water chemistry if stable pH and hardness are required.