While im on a roll...Can someone Help identify this??

[BillyBay]

Hi all, I'm looking to find out what is growing on my live rock, as I said before I'm a few months in and am beginning to find all these weird things in my tank, i take excellent care of my tank and just want to make sure this is something I don't need to worry about. thanks for any suggestions

 

[Crystal A]

What are we looking at? If its the purple stuff thats good. Coralline algae the one kind of algae you want in your tank.

 

[BillyBay]

Im srry I took the pic with my phone, if you look closely at the bottom you can see dark brown lines with dots. It" resembles something like " connect the dots".