Cleaning Sand when upgrading tanks?

[Reefer Rob]

It's best to buy new sand when you switch tanks. Skim a little of your old sand off the top if you want to "seed" your new tank. If you had a DSB it gets really nasty down deep, I wouldn't want to re-used it. Lately I've gone to about a 3/4" sand bed, which I stir a couple of times a week (like a Zeo reactor)