Spectrastone Special Light Blue Aquarium Gravel for Freshwater Aquariums, 5-Pound Bag Go to amazon.com Related posts Top 9 aquarium rocks blue Top 7 aquarium gravel blue FeatureWill not affect PHSafe for use in freshwater aquariumsNon-Toxic coating DescriptionLight blue aquarium gravel for freshwater aquariums. Will not affect PH. Safe for use in freshwater aquariums.