WOKE UP THIS MORNING AND SAT IN FRONT OF MY 180g TANK, EVERYTHING SEEMED NORMAL UNTIL I NOTICED THAT MY FLAGTAIL ACTED ODDLY. HE WOULD BE UPRIGHT ONE SECOND AND THEN LEAN ON ITS SIDE THE NEXT SECOND ALMOST FLAT ON ITS SIDE THEN TURN UPRIGHT AGAIN WITHOUT MOVING ON ITS CURRENT PLACE. HE SEEMS TO BE OUT OF BALANCE BUT DOESN'T LOOK SICK. HE WOULD DO THIS LIKE EVERY MINUTE OR SO. I DON'T SEE ANY VISIBLE INJURIES. PLEASE SOMEONE HELP ME ON THIS.