The contributor who relayed the incident about the little fish that "hitched" himself to them as they were diving, staying near to their chins and under them as they moved around (like he was hitchhiking) reminded me of another fish that I haven't been able to identify. This little fish does exacly the same thing as the woman described. I've picked one up a couple times. They swim along right in front of my mask most of the time. One little guy swam for a quarter mile as I was coming back from a snorkel out to one of the points. His tail was a-goin' a million miles an hour to stay in front of me. Once in a while he'd dash off to go pick up a tasty morsel of food as it floated by then dash right back. He stayed with me right until I walked out of the water. He was so darn cute!
Here is a still shot from a piece of video I took on a different day of the same kind of fish. The one with me looked like the smaller ones toward the rear with rectangle spots of a mottled olive green and white color.
They sort of look like Grass Porgy's or Yellowfin Majorra's, but the mottled and striping doesn't fit. (Unless this is the juvenile stage) but they certainly didn't act like the adult Mojorra's I've encountered.
I'd really be grateful to find out what they are.