OK here is a chance for my non diver specific side rant concerning Eagle Rays: Do not chase the Eagle rays with your Go Pro, you will appear as a sea monster to them and they will swim away. They really are better swimmers than you and you will not catch them but you may catch hell from your fellow divers on the surface for chasing them off. If you remain motionless you have a much better chance of close shots and an absolutely memorable encounter with some of the most beautiful creatures in the sea.
You will note that both of the above excellent videos appear to be done from a stationary or drifting postion