<a href=showthread.php?s=&postid=10170513#post10170513 target=_blank>Originally posted</a> by marduc
as opposed to siphoning the sand bed.. blast it well with a turkey baster to suspend some of the particulate matter, then siphon it out from the water column.
I do occasionally siphon towards the bottom of the tank.. if you have a decent siphon going you can hold the hose 1/2" or so from the bottom and pull the lighter detrital deposits without sucking up much sand.