Aquarium Gravel sera gray 2–3 mm, 6 L — decorative substrate

sera gray aquarium gravel with 2–3 mm granules in a 6 L package is a decorative substrate designed for freshwater aquariums. The uniformly sized gray granules create a natural-looking bottom layer that complements aquatic plants, décor and fish color. The gravel provides a stable bed for planting, helps anchor roots and increases surface area to support colonization by beneficial bacteria that contribute to biological filtration.

Advantages

The even grain size (2–3 mm) ensures consistent water flow through the substrate and reduces compaction compared with finer sands. Gray coloration offers a neutral background that highlights plant foliage and fish without overwhelming tank aesthetics. Packaged as 6 L, the product covers an appropriate substrate depth for small to medium aquaria and is pre-washed to reduce initial clouding when added to the tank.

Suitable for

• Community freshwater aquariums with small to medium fish
• Planted tanks where a stable rooting substrate is needed
• Ornamental displays and aquascapes emphasizing neutral backgrounds
• Aquariums requiring additional surface area for beneficial bacteria

Key specifications

• Granule size: 2–3 mm
• Color: gray
• Volume per package: 6 L
• Intended use: decorative substrate for freshwater aquaria
• Physical form: pre-washed gravel granules

How to use

Rinse the gravel briefly under running water to remove any residual dust before adding to the aquarium. Spread an even layer across the tank bottom to the desired depth, typically 2–4 cm for simple displays and 4–6 cm where planted roots should be anchored. Place plants, rocks and décor on top of the gravel and fill the aquarium slowly to avoid disturbing the substrate. Monitor water clarity during first hours and perform light rinsing in a separate container if necessary.

Usage recommendations

For planted aquaria, use a nutrient-rich substrate or root tabs in combination with this gravel to supply plant nutrients. Avoid mixing with very fine sand in large proportions to prevent compaction. When performing maintenance, use a gravel vacuum carefully to retain beneficial bacteria in the substrate layer.