Aquarium Gravel, Substrates & Decorative Pebbles

Build the Perfect Aquarium Foundation — The Best Aquarium Gravel & Substrates Available

Our Aquarium Gravel, Substrates & Decorative Pebbles collection features a carefully selected range of the finest aquarium gravels, aquatic substrates, ceramic biological media, and decorative pebbles available — chosen for their water safety, biological filtration support, aesthetic variety, and compatibility with all aquarium types. Whether you’re setting up a planted tank, a community aquarium, or a biOrb, these are the best buys for aquarium gravel and substrates at ALTOE.

Decorative Aquarium Gravels

• Marina Multi-Colour Decorative Aquarium Rainbow Gravel – Non-Toxic, 2kg – A vibrant, epoxy-coated rainbow gravel from Marina that adds a burst of colour to any aquarium while providing a biologically active substrate. Non-toxic, dust-free, and ready to use with minimal rinsing. Key features include:
  • Epoxy-coated, non-toxic & inert – Safe for all fish and plants with no harmful chemical leaching
  • Dust-free composition – Thoroughly cleaned before packaging for quick, easy setup
  • Optimised surface area – Encourages beneficial bacteria colonisation for naturally clearer, healthier water
  • 2kg bag – Generous quantity for a solid, colourful substrate layer
• FANTIAN Mixed Colour Aquarium Gravel – 2lb Decorative Pebbles for Plants – A natural, dye-free mixed colour gravel from FANTIAN in white, red, yellow, grey, and apple green (6–9mm). Safe for pets and children, and versatile enough for aquariums, plant pots, vases, and garden landscaping. Key features include:
  • Natural, dye-free & non-toxic – No coatings or chemicals — safe for fish, pets, and children
  • Mixed natural colours – White, red, yellow, grey, and apple green for a natural, earthy aesthetic
  • Versatile use – Aquariums, plant top dressing, drainage rocks, vases, and garden landscaping
  • Simply wash before use – Easy preparation with hot soapy water

Natural Aquatic Substrates

• Pettex Roman Gravel Harlequin Blend Aquatic Substrate – 2kg – A fine-grain, smooth-particle harlequin blend substrate from Pettex Roman Gravel, ideal for planted tanks and bottom-dwelling fish. Promotes anaerobic activity for a balanced biological ecosystem. Compatible with coldwater, tropical, and marine setups. Key features include:
  • Fine grain size – Ideal planting medium for aquatic flora with easy root anchoring
  • Smooth, rounded particles – Gentle and safe for bottom feeders and barbed fish
  • Universal compatibility – Coldwater, tropical, and marine aquariums
• Pettex Roman Gravel Jet Black Aquatic Substrate – 2kg – A sleek, professional jet black substrate from Pettex Roman Gravel that creates a striking, high-contrast backdrop for fish and plants. Fine grain for easy planting, smooth texture for bottom feeders. Key features include:
  • Jet black finish – Creates a dramatic, professional-looking aquascape that makes fish colours pop
  • Fine grain planting medium – Easy root anchoring for lush aquatic plant growth
  • Smooth, rounded texture – Safe for bottom feeders and delicate fish
• Marina Natural Beach Pebble Aquarium Gravel – 12–18mm, 2kg – Large-format natural beach pebbles from Marina (12–18mm) that create a stunning, authentic riverbed aesthetic. Chemically inert — won’t alter water chemistry or pH. Ideal for natural aquascapes and as a stable base for ornaments. Key features include:
  • 12–18mm natural beach pebbles – Large, natural stones for optimal water flow and a genuine riverbed aesthetic
  • Chemically inert – Will not alter water chemistry or pH for sensitive species
  • Stable, non-slip base – Provides a secure foundation for aquarium décor and ornaments

Biological Filter Substrate

• biOrb Ceramic Media Brown – High Surface Area Aquarium Filter Substrate – A premium porous ceramic biological filter substrate from biOrb, designed to maximise beneficial bacteria colonisation for superior biological filtration. Natural brown finish blends seamlessly into any aquascape. Key features include:
  • High surface area porous ceramic – Maximises biological filtration capacity for crystal-clear, healthy water
  • Natural brown finish – Blends naturally into any aquascape aesthetic
  • Versatile use – Primary substrate or supplement to existing filter media

Why This Is the Best Selection

From Marina’s vibrant rainbow gravel and natural beach pebbles to Pettex’s planted tank substrates, FANTIAN’s natural mixed pebbles, and biOrb’s high-surface ceramic biological media, every product in this collection has been chosen for its water safety, biological value, and aesthetic quality. These are the best buys available for aquarium gravel, substrates, and decorative pebbles at ALTOE — the perfect foundation for a thriving, beautiful aquarium.