We advocate deep sand beds, though you have to give it some time. When you have a well established one (that is teeming with little critters) it is really the best. However, as previously mentioned, you shouldn't reuse sand. Everything that makes a deep sand (or crushed coral) bed of value will get very nasty once it's been disturbed. Here is an amazing article about it.
Hydrogen Sulfide and the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com
Hydrogen Sulfide and the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com

