I’m not going to be any help with a definite Y/N on the spots in your photo. My eyes can’t make out what I am looking at, I have the same issue (not seeing) what is happening in my own tank.
Those kinda look like a tiny flatworm, but the shape is not convincing me that it is.
How does the Rainbow look otherwise? Are the polyps normal? Some of these things are not a problem, I don’t see bite marks so hopefully it is not going to ruin your day?
But don’t ask a blind person for driving directions, let’s see what other people can see?