Aquarium Substrate Fish Tank Features: 1. Long fertility: the products contain the rich trace elements, and this aquarium gravel has a longer life than common gravel, and it is really economic. 2. Easy Method: it will never become powder and muddy water. You do not need to wash it, and it can be put in the fish tank directly to be used. 3. Economic Friendly: the nutrient composition is in the gravel and can send out continuously which will not pollute the water and be harmless to fish. 4. High Stability: The gravel is not decomposed easily and can keep the water clean to provide the better living environment for aquarium plants 5. Senior Color: mysterious solid black can make your fish tank more attractive, and you have the unique fish tank. Package Include: 1 x aquarium substrate Shipping 1.If you need to buy in bulk, please contact, we will reply in 24 hours. 2.We are always working hard to ensure your package arrives as soon as possible. Please understand that some factors like weather, high postal traffic, and the performance of shipping companies are outside of our control. 3.Usually product Reaches after about 12-45 business days depending on destination. If you have not received your shipment within 45 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Refund or resend product will be offered if item still not received. 4.We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important. We ask you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns. It is impossible to address issues if we do not know about them! THANK YOU :)