To me, DSB is a term that relates to a sand bed that acts as filtration, nitrate reduction and houses all kinds of microfauna and sand cleaners. This is not cosmetic, but serves a purpose in the life cycle of the reef tank.
I consider my 3" sand beds a DSB since they provide this function. They do not have to be 6" inches, IMO.
I consider my 3" sand beds a DSB since they provide this function. They do not have to be 6" inches, IMO.