Super Aquarium Bio Volcanic Lava Rock (10-30mm) Aquarium Fish Tank Filter Media, Marine, Sump, Pond Filter Media (2kg)
- Clarifies the water and stabilizes the pH
- Ideal for cascade, external, internal, pond, sump filters. Lava Rock is suitable for all marine and fresh water aquariums.
- This will help to keep the beneficial nitrifying bacteria on its surface