Aqua One Natural Gravel Gold Mix 5kg (12213) Aqua One Natural Gravel is true to its name, being a natural gravel with no added colours, making it safe for fish and aquatic life. It allows replication of a natural environment providing a pleasant and peaceful atmosphere. Can be used as layered substrate for planted and shrimp tanks. Can be used for decorating aquariums, fish bowls and vases Specifications: Available in 4 sizes 12203. Gravel Natural Gold Mix 10kg 12233. This does not include food, live plants or any other perishable items. You need to include the Return & Exchange Form along with the item(s) you are returning in their original condition and any packaging that came with it.