Description
The ANS Black Volcanic Rocks L 15Kg 25 40Cm 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 L (25-40cm, 15kg) for Large SG Aquascapes
At 25-40cm these are statement stones meant to define the backbone of a bigger tank, setting the dominant peaks and slopes of a mountain or canyon-style layout. Volcanic rock’s lightweight, porous nature is genuinely useful here: large hardscape can add serious mass, and in condo or HDB installations every kilogram counts toward floor loading, so the lower density lets you build commanding height without the weight penalty of solid quarried stone.
The open pore network also works for you biologically, seeding beneficial bacteria that supplement your filter in our warm 27-29C water where the nitrogen cycle never slows. The dark, craggy faces grip moss and epiphytes like Anubias and Bucephalandra, and create excellent shaded hiding spots for fish and shrimp. Always rinse and dry-fit large stones first, and support heavy pieces on a substrate or foam base so they cannot crack the tank floor.
Buy enough to choose the best faces forward. Explore our decorations range, and our volcanic-rock-only aquascape guide and hardscape rock comparison will help you plan the layout.

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