Vacuuming - Part Deux

[Magickiwi]

I have about a 3" DSB and would be interested in learning a method of vacuuming the sand that doesn't result in all the sand being siphoned out of the tank. I've had a couple golden head gobies that do a wonderful job of sifting the top couple centimeters of sand but one took a trip out of the tank and the other wound up as lunch for my carpet nem. Every time I stir or disturb the sandbed my phosphates go through the roof.