Copper/Bronze ish Spots Growing on rocks

[Sims Reef Tank]

Hello everyone! I am brand new to this hobby and set up my 30-gallon reef tank last week. Today I noticed there are some bronze/copper ish-looking spots growing on my rocks. Can anyone tell me what it is and how I should proceed? Thanks!

 

[lapin]

Dont do anything
This is the first sign of life in your tank

Oh and howdy and welcome