Enhance your aquarium's beauty with the Betta World Aquatic Crystals Sand from Penn-Plax. Each 12.5 oz bag contains enough luminous dark blue glass crystals to decorate a 2-gallon tank, creating a vibrant underwater landscape that makes your aquarium truly pop. Perfect for aquascaping, these shimmering crystals add depth, texture, and support for plants, driftwood, and other decorations. Beyond aquariums, they can also be used as stylish fillers for table vases or wall vases, adding a touch of elegance to your home decor. Safe for both fish and aquatic plants, these non-toxic, non-reactive crystals won't affect water chemistry, making them an ideal decorative choice for any aquatic habitat.