Spots on rock ID?

[jeffmr4]

I have these brown or dark purple dots on all my rocks. The rocks are caribsea life rock so they came purple. Does anyone know what these are? (last photo of all)

 

[Dread Pirate Dave]

I can't really tell with that video. Possibly red turf algae? Can you take a photo under white light? That would help.

 

[teleportinghere]

The purple is probably coralline algae and the other is hard to tell under this spectrum.

 

[jeffmr4]

Here is a closeup in as white light as I have.