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substrate actually just means what ever is covering the bottom of the tank. it can be dirt, sand, gravel, or some synthetic man made substance. you can even mix them up or layer them. for plants it is generally suggested 2-3 inches of substrate. you would be dealing with a low light tank so you could grow anubias, java ferns, crypts, java moss.
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~Matt~
 If you put off what you can do today until tomorrow it will never get done cause tomorrow never comes. It's always today.  
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