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Amazon.com : Ultum Nature Systems Controsoil - Aquarium Substrate Soil Porous Gravel for Natural Aquatic Freshwater Planted Fish Tank, Brown (Fine, 3 Liters) : Pet Supplies
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Amazon.com : AquaNatural Diamond Black 10lb, Premium Gravel and Substrate for Aquariums, Fish Tanks and terrariums, 1-2mm : Pet Supplies
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