HUNTING BUDDIES

Sunrise Sculpted Tree, 9 x 12, oil

An eel and a Peacock Grouper are hunting together.  It goes like this:  They swim alongside each other so close that they are tickling each other's sides as they undulate through the water.  Then the eel finds a hole in the coral and goes through, while the grouper swims to the outlet to see if something comes out.  Sometimes the eel wins, sometimes the grouper wins.  Then, they tickle-swim to a new spot.
I wonder how these partnerships get set up.  Does one of them go, "Meet me at 7:30 tomorrow by the tall green coral."?