Crushed Coral 3-4mm Aquarium Gravel 15Kg

Crushed Coral 3-4mm is a premium, naturally sourced substrate that does more than just look beautiful — it actively buffers your aquarium water, raising and stabilising pH levels to create the ideal environment for African cichlids, marine fish, and other hard water species. Its bright, natural white tones add a clean, reef-inspired aesthetic to any tank.

Further Information

• Type: Crushed coral substrate
• Grain Size: 3–4mm
• Colour: Natural white / cream
• Best For: African cichlid tanks, marine aquariums, hard water species, pH buffering
• pH Effect: Raises and stabilises pH — ideal for tanks requiring pH 7.5–8.5
• Placement: Full tank base layer (recommended depth: 3–5cm)
• Skill Level: Beginner to Advanced
• Note: Rinse thoroughly before use. Monitor water parameters after adding.

How Much Do I Need?

Standard tanks — guide only, tank footprint will determine quantity required:

• 60L tank → ~8kg
• 120L tank → ~15kg
• 200L tank → ~25kg

Planted tanks — we recommend a minimum of 2" (5cm) of substrate depth for healthy root development. Double the quantities above as a starting guide. Note: crushed coral will raise pH and may not suit all plant species.