Aquarium Substrate | Grey - 1/8 to 1/4 inch

Our substrate is 100% real slate stone that is sourced, sorted, washed and packaged by our family owned business in the USA.  Each bag or box is a mix of small gravel from 1/8" to 1/4" (some pieces may be slightly above or below this range).  Absolutely no coatings on this or any of our stones.  An excellent gravel for Aquascaping aquariums or use it as a topper for soil in a planted tank. The grey/blue color makes wood, plants and other inhabitants  and decorations pop. Pairs perfectly with our Natural Slate Stones that come in sizes from 1 inch up to 10 inches for a cohesive, natural scene. Perfect scale for miniature models and scenes as well as a topper for succulents and other potted plants. This substrate is a beautiful, deep grey matte color, with a hint of blue.  Because this is a natural stone, some white quartz or brown stones may be mixed in that add to the natural look.  Some of the quartz pieces may have a small amount of calcium.  We have not found this to alt