Aquarium and Terrarium Polished Black Pebble Gravel NB Minerals 10–20 mm, 5 kg

Aquarium and Terrarium Polished Black Pebble Gravel NB Minerals 10–20 mm, 5 kg is a decorative substrate composed of smooth, rounded polished pebbles sized 10–20 mm. Intended for freshwater aquariums and reptile terrariums, the black pebbles create a natural, contrast-rich base that highlights plantings, ornaments and the colours of fish or reptiles. The 5 kg bag supplies enough material to cover small to medium-sized tanks or to blend with other substrates for layered landscaping.

Advantages

The polished finish reduces sharp edges, offering a stable surface for planting and ornament placement while minimising risk of damage to delicate fins and soft-bodied animals. The uniform 10–20 mm fraction ensures consistent visual texture and good water flow between grains. Being natural stone, the pebbles are chemically inert and will not noticeably alter water parameters when rinsed before use. Packaging in a 5 kg bag provides a practical quantity for hobbyists and terrarium keepers.

Suitable for

• Freshwater aquariums as a decorative substrate or base layer
• Terrariums and paludariums for reptiles, amphibians and terrestrial plants
• Background landscaping, accent areas and planting anchors
• Combining with finer substrates to create layered visual effects

Key specifications

• Pebble size: 10–20 mm
• Finish: Polished, smooth surface
• Colour: Black
• Material: Natural stone pebbles
• Net weight: 5 kg

How to use

Rinse the pebbles thoroughly under running water until the rinse water runs clear to remove dust and fines from processing and transport. Spread an even layer across the tank or terrarium floor to the desired depth, typically 1–3 cm for accent layers or 2–5 cm when used as the primary substrate, depending on plant and animal requirements. Place ornaments and plants on top, using the pebbles to help anchor stems and décor. For aquariums, add water slowly to avoid displacing the substrate.

Usage recommendations

Before introducing animals, monitor water parameters after setup to confirm stability. Avoid using the pebbles with species that require very fine, sandy substrates for burrowing. Combine with nutrient-rich substrate layers beneath the pebbles when keeping rooted aquatic plants that require fertilised substrate.