Rock and Pebbles

Create depth and texture

Rocks are the foundation of many striking layouts, from a minimal arrangement of Seiryu stone to a stacked, cave-filled cliff of dragon stone. Smaller stones and quartz finish the base of your rockwork or edge a path through the substrate.

What are aquarium rocks and pebbles?

They are natural or synthetic stones sold for use in tanks. They will not break down in the water or spread disease, but natural rock can release minerals that change your water chemistry, which suits some fish better than others.

Will rocks change my water?

Some will. Limestone rocks, which include many grey, striated stones such as Seiryu, can raise pH and hardness, while inert rocks such as slate usually will not. If you keep soft-water fish or shrimp, be sure to research your chosen rock before adding to the aquarium.

How do I choose and place rocks?

Pick a rock type and stick to it for a natural look, and use a few larger pieces rather than many small ones. Rest heavy rocks on the base of the tank, not on top of the substrate, so burrowing fish cannot undermine them. Finish the base with aquarium sand or gravel.

What goes well with rocks?

Mosses and ferns such as Anubias attach well to rock, so see our epiphytic aquarium plants. For a more natural layout, combine stone with bogwood and driftwood, or browse all aquarium hardscape.

Our 10 Aquascaping Ideas guide has layout inspiration to help you get started.