When you get bored......

[Vancouver Reefer]

You mean like this:

[golf nut]

Yes, but even lower so you blow across the surface of the sand and get the detritus up into the water column. your returns from the sump will point down the back and effectively the whole tank will rotate backwards.

[Vancouver Reefer]

Ok so i get about lowering the returns from the OM and getting them to blow across the sand bed, but are you also suggesting i put elbows on and blow the return water directly at the bed??? That will stir up the bed every time the flow hits it???? Or am i missing something????