Whenever possible, it's best to avoid constant laminar flow. Wave boxes and dump boxes are unsightly and have also been known to blow out tank panels from the constant waves pushing against them (this is especially true of large panels), but you can use other means, such a SCWD's (I'm a huge fan of these), or any of the various electric/electronic wave makers.
Another way to get some semi-random current flow is to aim two or more returns so the flow patterns crash into each other, thus making random flow patterns and eddies.