The bright fish in the foreground is cool, but as you look into the scene you see another, and then another fish.
It must not be that hard to camoflage in this environment, so the decision to use something like
bright white and yellow, must have some biological advantage.

The fish with the vertical bars are called Convict Tang's (Acanthurus triostegus). The larger black fish are probably Ring Tail Surgeonfish (Acanthurus blochii) but the photo is quite low quality.

Coming, going, you tell me - these fish (like me) were being dragged in the current and (unlike me) stopping
on each ebb to chew one whatever was on the rocks.

My current thinking is this is a bluethroat Wrasse.

These fish just hang out on the bottom in the flow.  From a distance, they look like some sort of grass just dragging in the current, but they are live.