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Dry sugar-sized aragonite sand substrate for marine aquariums Functional marine substrate buffers aquariums from pH swings Fine grains pass easily through sand sifting aquarium inhabitants CaribSea’s dry marine substrates are recognized worldwide for their purity and precision. The substrates are purposely engineered and free of impurities such as ash, metals, pesticides, and silica; which allows you to create a safe and beautiful environment for your fish and invertebrates. Precision grading makes system design a breeze! No matter what type of system you are setting up, Caribsea substrates are perfect for the filtration method and habitat you are creating.