The 
Aqua Natural South Seas Base Rock Stacks
 are a premium aquascaping material made from fossilized Oolitic Aragonite. Unlike standard base rock, the "Stacks" version is specifically hand-sliced in Australia to provide flat sides, allowing for stable, architectural layering in your aquarium. 
 
Key Specifications
Material: 100% natural fossilized Oolitic Aragonite.
Porosity: Exceptional micro and macro porosity with approximately 50% void space, providing a massive surface area for beneficial bacteria.
pH Buffering: Naturally high calcium carbonate content helps maintain stable, high pH levels.
Safety: Harvested from land-based ancient reef systems with zero marine life impact.
Environment: Ideal for marine reef tanks, African Cichlid setups, and hard-water freshwater environments. 
 
Product Features & Usage
Architectural Utility: Use flat-sliced pieces to build stable caves, ledges, and overhangs.
Ready to Use: Requires no curing; a simple rinse to remove dust is recommended before placement.
Attachment Points: The gnarly, pitted surface is perfect for attaching coral frags or supporting invertebrates. 
 
 
Available Pack Sizes
4.5kg Stacks: Suitable for smaller tanks or accent pieces.
9kg Stacks: Standard larger pack for building substantial structures.
Mixed Packs: Also available in 10kg and 20kg bags with a random assortment of natural (non-sliced) shapes ranging from 10cm to 30cm.