Brand new bag of ADA Amazonia light. I bought the wrong bag and I don't want to pay to ship it back. Works great for planted tanks and keeping fish/shrimp that need a low pH. "ADA Substrate provides the perfect medium for plants to grow in and contributes to the overall aesthetics of your layout. ADA substrates deliver nutrients to plants and provide optimal texture for root growth. With its natural earth color, it shows aquascapes visually more natural. It contains the same natural black soil as Amazonia, it sufficiently promotes the growth of aquatic plants."