Sorry, should have been clearer.
When you do a water change and clean the tank. How much of a pain is it? Do you have to remove all those shells and vacuum the sand etc? Or do you just do regular water changes and leave it as it is down there?
If you have good water flow across the bottom of the tank, the fish debris and food will get sucked into the filter and not settle on the floor of the tank.
To do this, setup a bubbler with a long air stone to create a 'bubble curtain', this creates a nice water draft in the tank from top to bottom.
I would assume your filter will give you some kind of circular motion and the bubble curtain will do the up/down motion thus covering all areas in your tank.
So in conclusion, you will never have to vacuum your gravel/sand/shells again.
Edited by MrLeifBeaver, 12 September 2014 - 02:18 PM.