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If you want a particle substrate, Children's Washed Play Sand is the only one that I would personally recommend providing that your BD is 10+" or larger. It's available at most larger hardware stores or Garden centers for something like $4-$5/50 lb bag. Be sure that it is sand & not gravelly, if there are larger pebbles in it, it must be strained. Keep your BD well Hydrated & your temps up to par & it works just fine. The other alternatives are Non-particle substrates.so i should use sand