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Nice clean sand that is meant for an aquarium. Be sure not to get saltwater sand for a freshwater aquarium. The reason sand is best is that (1) unlike gravel, it does not have anyplace for uneaten food to hide. Uneaten food is the number one polluter of aquariums, and pollution causes disease. (2) Some fish are sensitive to the rough edges of gravel, and some of them even become damaged by it -- such as certain loaches and catfish, whose barbels get scraped up by it. People keep buying gravel though just because of the cosmetic effect. I'd suggest getting some nice, fine-grained, soft white sand. It makes a great background for any color of aquarium furniture.

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Q: What is the best substrate for tropical freshwater aquariums?
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