Fisheee Aquarium Gravel No 3 is a cost-effective option for your aquarium needs using our own mixture of aquarium gravels. Our team carefully mixes natural river stones of four different colors to create a unique blend that is both safe for fish-keeping and visually appealing for display aquarium use. The river gravels are originally collected by color and mixed appropriately. This naturally occurring river gravel is completely safe to use in any freshwater aquarium environment. It is ideal for low-maintenance aquariums that require an authentic appearance.