All items placed in an aquarium must be safe for your fish and, if possible, must work to make their life in captivity less stressful. You should avoid items, such as rocks or driftwood, that could carry diseases from a natural body of water (ocean, lake, pond or stream); items that may give off a toxin, like garden or field stones exposed to fertilizers or pesticides; and objects that are sharp or that could trap your pet fish.

For more information, please read Aquarium Accessories – What Fish Need.