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I have only seen sand in saltwater tanks. I can't see why you couldn't use sand in a freshwater tank, though. Just be careful because a lot of the aquarium sand pet stores sell is treated with bacteria meant for saltwater tanks. I'm not sure how it would affect a freshwater setup.
 

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Hi Libby, by "rays" do you mean sting rays? Are there freshwater sting rays?

CuteLilPleco said:
Sometimes you have to worry about the roughness or size if you have specific bottom dwellers or feeders. For example rays need sand or they scratch themselves when burying. Otherwise i always use gravel becasue fish waste and stuff doesn't sit on top of it like it does with sand. A small sized gravel in a natural brown or tan color usually does the job.

Libby
 
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