Is it coralline algae

Jumping on this old post: I'm finding some purple spots on my rocks. It is not very easy to scrape off. Is it too optimistic to hope that this is coralline algae?

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sure looks like it to me.
 
That is exactly what early coralline looks like. Good job!
 
Can also be fuzzy red algae or Polysiphonia which is a type of red hair algae
 
Thank you everyone for your comments. I am now believing that indeed it is coralline algae. Vetteguy53081, I don't think it is the algae you mentioned (after googling them, they look different from what I see on my tank), but I'll pay attention to it.
 

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