Mystery to me ?

[Spaceshrimp]

So i recently asked what something was on my rock and people said it was poop but now it tranformed into something purple and it started off brown

 

[trido]

Pictures sure help.

 

[Spaceshrimp]

This is the best picture i could get and im thinking they are some kind of flatworm

 

[trido]

Possibly. Do they move or are they stationary?

 

[vetteguy53081]

Palnarian or Turbellariana flatworm

 

[BloopFish]

Hard to tell because of the picture, could even be asterina. Best bet is to try to scrape off a pieces and take a picture of that.