ANS Black Volcanic Rocks M 20Kg 15 25Cm

The ANS Black Volcanic Rocks M 20Kg 15 25Cm is an aquarium decoration that adds character to your tank setup.

Key Features

• Aquarium-safe decoration for freshwater and tropical setups
• Non-toxic and safe for fish, shrimp, and plants
• Provides hiding spots and visual interest

ANS Black Volcanic Rocks M (15-25cm, 20kg) for SG Tank Layouts

The 15-25cm grade is the everyday building size, large enough to read as real structure yet easy to position and rotate while you compose. Volcanic rock’s porous, lightweight body keeps overall hardscape weight manageable, a real benefit in flats where stone, substrate and water together test floor-loading limits. You can stack confidently to build slopes and crevices without the dead mass that solid rock would add to the same volume.

Those pores are not just aesthetic; they harbour nitrifying bacteria, so a substantial rockscape quietly supports your biofilter in our 27-29C tanks where bacterial activity stays high year-round. The rough black texture is ideal for attaching moss, Anubias and Bucephalandra, making it a natural choice for low-tech, no-CO2 scapes. Rinse each piece to shed grit and dust, and dry-fit your composition before flooding so you are not reaching into a full tank to adjust.

A few extra stones give you more matching faces to choose from. See our decorations range, and consult our volcanic-rock-only aquascape guide and hardscape safety guide before placement.