Aquarium and Terrarium Polished Black Pebble Stones Sera 10–20 mm, 10 kg bag

Polished black pebble stones by sera, sized 10–20 mm and packed in a 10 kg bag, are designed for use as substrate or decorative gravel in aquariums and terrariums. The smooth, polished surface creates a consistent dark background that highlights plants, fish and ornaments while providing a stable base for rooted plants and larger decorative elements. These pebbles are intended for freshwater aquaria and reptile enclosures where a coarse decorative gravel is preferred over fine sand.

Advantages

The polished finish reduces sharp edges, simplifying cleaning and reducing the risk of injury to bottom-dwelling animals. The uniform size fraction (10–20 mm) ensures good stability for planted elements and decorative pieces and limits migration of fine substrate particles. The dark black color enhances contrast and visual depth in both aquariums and terrariums, and the non-porous surface minimises debris accumulation and makes rinsing straightforward.

Suitable for

• Freshwater aquariums as decorative gravel or top layer over technical substrates
• Terrariums and vivaria for reptiles, amphibians, and invertebrates
• Planted tanks where large gravel is used to anchor heavier plants or ornaments
• Decorative displays and paludaria where a dark, uniform base is desired

Key specifications

• Material: polished natural pebble
• Grain size: 10–20 mm
• Finish: polished, smooth surface
• Pack weight: 10 kg
• Color: black
• Intended environment: freshwater aquariums and terrariums

How to use

Rinse the pebbles thoroughly with freshwater until the rinse water runs clear to remove dust and fines from transport. Spread an even layer according to your setup: a decorative top layer of 1–3 cm or a thicker base layer where stability for plants and ornaments is required. When used over a technical substrate for planted tanks, leave sufficient depth of technical substrate beneath and avoid mixing excessively to prevent pore-clogging. Position heavier ornaments directly on the pebbles to ensure stability.

Usage recommendations

Before adding animals, cycle the aquarium as usual and monitor water parameters. For terrariums, ensure the pebble layer is compatible with your chosen humidity and drainage strategy; combine with a drainage layer if necessary. Regularly remove organic debris by siphoning or spot-cleaning the surface to maintain water quality and the appearance of the polished pebbles.