Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
To cover more surface with a spray bar drill more holes front and back, and center it. The holes could spray pretty much horizontally, if they do not spray too hard, or you could aim them upwards a bit (Covered tank, of course!).
You want to have enough holes so they water is not coming out too strong, but strong enough to scatter over most of the tank.