Fisheee Dark Red Aquarium Gravel/Substrate is a cost-effective option for your aquarium needs using our own mixture of aquarium gravels. Our team carefully mixes natural river stones to create a unique blend that is both safe for fish-keeping and visually eye-catching for display aquarium use. The river gravels are originally collected by color and mixed appropriately. This naturally occurring gravel is completely safe to use in any freshwater aquarium environment. It is ideal for low-maintenance aquariums that require an authentic appearance.