I agree with the either poster.
Hair algae growth especially the long stringy stuff is quite normal when you first start up a tank.
Remove it from the glass and the rock as best you can, do a water change and after you have waited a month after your tank has cycled and than add a fish or two take stock of the problem.
If the problem becomes a serious problem consider borrowing a sea hare from someone making sure you acclimate it very slowly. Remove him when almost all the algae is gone or you will starve her to death.
Cooking the rock in your case is extreme. It will kill not only the algae but all living things including encrusting coral, worms, pods, bacteria, good algae, squirts, tiny invertebrates like snails and crabs etcetera.
In other words all the good stuff your fish and coral need.
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