Black Volcanic Lava Rock is a great addition to any aquarium. These will not affect water quality or chemistry and provide fish with a more natural environment. They encourage a natural biological filter that improves water quality, boost oxygen levels, and controls ammonia and nitrites for a cleaner and healthier aquarium.
Please indicate in your Order Notes (located below your cart) if you'd like to receive larger or smaller pieces equalling the amount of kilograms you have purchased. We will do our best to match your request. This is a natural product so shapes and sizes vary.