Keep in mind this is a quick drawing.. [img]images/smiles/icon_biggrin.gif[/img]
How it works is that you take the outlet of the powerhead and attach some tubing to it. Submerge the other end deep in the sand bed and turn it on. [img]images/smiles/icon_smile.gif[/img] The sand bed acts as a trap for the smaller particles that were in suspension in your water column. Put more than one and you are moving twice the H2O and sand underneath. It makes a neat little bubbling area. looks like somehhting is coming up from under the sand. [img]images/smiles/icon_biggrin.gif[/img] Kinda like the worms on the movie Dune. [img]images/smiles/icon_biggrin.gif[/img] [img]images/smiles/icon_biggrin.gif[/img]
Hope this helps..