Last time I was out at Eagle Ray Canyon, we had a flight of 5-6 come by us too. Unfortunately, viz that week was just terrible.
I'm with you, Harriette. I just love these creatures and will always remember the solitary dive out at Halfmoon Wall, where an eagle ray came along and swam with me (or was it let me swim with it) for a good 5 minutes. I've told this story before.
I got heck from the DM for not staying with the group. Naughty me . . . as if I'd ever let a chance like that go by, just to stay with the group.