*Listing is currently out of stock and price has been raised to an absurd amount to keep it from losing sales history due to inactivity. I should have more in stock by February.*

  This listing is for a half-pound + of assorted sized black lava rock. Because of its porous surface, it is great for use in aquariums where bacteria colonies will thrive on it. This quantity of rock is intended for stacking or placing in another substrate, such as sand, not as the sole substrate for any more than a half-gallon aquarium. The lava rock has been rinsed once but will need to be washed again due to abrasion during shipping.