Understanding flathead behaviour helps you choose the right locations, bait or lure and time of day.
The Flathead is an ambush predator. They do tend to lay buried in the sand, just their eyes showing, waiting for food.
Logically the outgoing tide is a great time for them to feed this way.
However, this doesn’t mean they do not cruise for food. Because they certainly do.
So while many flathead are going to be caught on the bottom it’s not uncommon to catch them midwater.
Some people have even had success using top-water lures over sandflats.