Oh that, that is coralline algae, and with time your tank will also get it. To get it started you need to have a bit already in your tank or get a small piece of rock from the lfs or a friend that has some (the coraline algae will show u in many different colors).
To get the algae growing you will need to check you calcium and alk levels and make sure the calcuim is over 400 and alk (dkh) at 8-10 worked well for me. After that the coralline should just start growing.
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RSM 250. Clownfish, Fox face, Blue tang, Yellow tang, Kole tang, Clown tang, Coral beauty angel, French Angel, splendid dottyback. CUC, softies, lps, sps.
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