Using old sand?

I have a question that I just didnt know the answer for. I have a BB ten gallon running right now that I anm going to clean out and reaquascape and I was wondering if I would use the old dried sand from my 30 gallon or if it would be harmful to use old sand. I know this may be a dumb question but I have just never heard anyone talk about this before.
 
I have read here where people use old sand but always give it a good wash with RO prior to putting back in tank. IMHO you would be better off to just go with new sand on such a small tank since the cost will still be minimal. HTH
 
Here's how to wash that sand. I was tired of typing it out, and made a page of it. http://melevsreef.com/rinsing_sand.html
 
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