in a 3g i cant imagine there will be much of anything in there to feed...no food = no mess to clean up...and a suitable clean up crew will keep things the rest of the time...personally i like the look of the wand, and it give lots of organisms places to hide and hunt...i have yet to hear of any parasites being introduced to any ones tank from the sand, though i am sure it isnt out of the realm of possibilties, it certainly isnt on my mind when i set up a tank...
FWIW, in my 5g i have never siphoned the sand, i has now been running for a year and six months without issue...i have three hermit crabs, a zillion chitons, million spaghetti and bristle worms, along with a tonne of collonista snails and keyhole limpets...together with the help of a serpent star do a pretty god job stirring the sand and eating anything that falls on it..