Okay...When I clean I jam the tub deep in the sand bed and weatch all the brown water flow....I thought this was cleaning, but in actuality I am getting rid of muchneeded micro organisims??? I have pletny of snails, crabs, I have a golby(Oh, any my goby keeps my sand white 98% of the time...he is fun to watch).....

So a water change then is is taking some water out of the lower level of the tanks water column while leaving the sand be as undisturbed as possible.

Advice on the technique?