Aqua Ocean Premium Coral Sand – Size #4 (3-5mm) | 5kg Bag
Aqua Ocean Premium Coral Sand is a natural aragonite-based substrate sourced from pollution-free islands in the South China Sea. Free from phosphate, nitrate and surface contaminants, it is clean, safe and ready to use in marine and freshwater aquaria. The main component is calcium carbonate, which naturally buffers and stabilises pH in seawater, making it ideal for reef, marine and hard-water setups such as African cichlid tanks.
Key Features
- Grain Size: 3–5mm (Size #4 – Medium to Coarse)
- Weight: 5kg per bag
- Composition: Natural aragonite / calcium carbonate
- Origin: Pollution-free islands, South China Sea
- Free from: Phosphate, nitrate and surface contaminants
- pH Buffering: Helps stabilise pH in marine aquariums
- Large surface area – supports beneficial bacteria for biological filtration
Best For
- Marine, reef and FOWLR aquariums with medium to high flow
- African cichlid and hard-water tanks where pH stability is required
- Use as a base layer under finer grades for a layered substrate look
- Sumps and refugiums as a buffering biological media
Instructions for Use
- Rinse thoroughly with fresh water before adding to your aquarium
- Recommended depth: 2.5–5cm for fish-only tanks, deeper for biological filtration
- Add slowly to avoid clouding the water; clarity returns within a few hours
- Not recommended for fine-sand-sifting species due to larger grain size
🥄 Feeding Guide:
Serve at room temperature as a complementary food to support a balanced diet. Offer alongside dry food and ensure fresh water is always available. Store in a cool, dry place. Refrigerate after opening and use within 24 hours.

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