Aquarium and Terrarium Polished Stones sera Black Pebble III 20–30 mm 10 kg

sera Black Pebble III polished stones are decorative, smooth pebbles sized 20–30 mm and supplied in a 10 kg pack. Intended for aquarium and terrarium use, these stones serve as an inert substrate or decorative gravel that creates a natural look while providing a stable base for plants and ornaments. The rounded surface reduces debris trapping and is compatible with freshwater systems and reptile enclosures where non-toxic, chemically neutral decor is required.

Advantages

The polished finish yields a visually consistent, low-porosity surface that is easy to clean and maintain. Uniform 20–30 mm sizing ensures good stability for decorative elements and live plants, while the 10 kg quantity covers a significant area depending on desired depth. Being inert and non-reactive, these pebbles do not alter water chemistry in freshwater aquaria and are suitable for terrarium environments where stable, safe substrate materials are necessary.

Suitable for

• Aquarium substrate for freshwater tanks
• Decorative layers in terrariums and paludariums
• Base for planting live or artificial aquatic plants
• Reptile enclosure floor covering where smooth, non-toxic stones are preferred

Key specifications

• Pebble size: 20–30 mm (rounded, polished)
• Finish: polished, low-porosity surface
• Pack weight: 10 kg
• Intended use: aquarium and terrarium substrate/decorative gravel
• Chemical behaviour: inert and non-reactive in freshwater environments

How to use

Rinse the pebbles thoroughly with clean water before first use to remove any dust or residual particles from packaging. Spread the stones evenly across the bottom of the aquarium or terrarium to the desired depth, taking care to create a stable, level surface for plants, driftwood, or ornaments. For aquaria, combine with filtration and routine water testing to monitor stability; these pebbles do not replace biological substrate layers if required by specific plant species. In terrariums, position stones to allow for drainage layers or humidity control as appropriate for the housed species.

Usage recommendations

For best results, use a layer thickness suitable for the intended function: a shallower layer for decorative coverage or a deeper bed where plant root anchorage or moisture retention is needed. Avoid sharp cleaning tools on the polished surface to maintain the finish, and perform periodic rinsing during maintenance to prevent buildup of organic material.