CaribSea Black River Rock

CaribSea Black River Rock is a bold, dark river stone that turns a freshwater layout into a dramatic one. CaribSea suggests pairing it with white river rock or a pale substrate like Tahitian Moon or Moonlight Sand, and that contrast is exactly where this stone shines: dark rock against light sand reads like a real river bed and makes fish color jump. Build around it with our freshwater plants.

Buying Options

The 25 lb box works out to about $2.60 per pound, so it saves roughly 13% over buying the same weight loose. Buying by the pound is the way to go when you want to choose specific shapes for a focal point.

Why This Rock

• Deep black river stone for a dramatic, high-contrast aquascape
• Natural stone with natural color, no paints, dyes, or coatings
• Pairs beautifully with white river rock and pale substrates like Tahitian Moon or Moonlight Sand
• Smooth, tumbled river shapes that stack and nestle naturally
• Buy loose by the pound or as a full 25 lb box

Setting It Up

Rinse the rock before it goes in to clear off dust from handling. Build your hardscape on the bare bottom or on a thin base layer so the pieces sit stable, then add substrate around them. If you are stacking taller structures, seat each piece so it cannot shift and keep stacks clear of the glass.

Specifications

Recommended Pairings

• Freshwater plants to soften and green up the hardscape
• Freshwater supplies including pale substrates that set off the black stone

FAQ

How much rock do I need? A rough starting point is 1 to 1.5 lb per gallon for a full hardscape, less if the rock is just a focal point. Bring your tank dimensions in and we will help you pick.

Can I pick my own pieces? Yes. That is the whole point of the per-pound option, you choose the shapes you want and we weigh them at the register.

Will it change my water? It is natural stone with no paints, dyes, or coatings. Rinse it before use as you would any hardscape.

Freshwater or saltwater? It is sold here as a freshwater aquascaping stone, and it looks its best against light freshwater substrates.