You want to go through the
nitrogen cycle. At the end you should have no nitrites,ammonia, phosphates. Nitrates build up in the rock from food, fish poo, excess garbage and produce phosphates which produce algae....no rush in curring your rock, let it run its full cycle....keep the lights off, let the corralline algae grow, keep checking your basic chemisty paarameters, ie, nitrites, ammonia, nitrates, phosphates, when they reach 0, your good to go....water changes are a great help in lowering nitrates and thereby keeping phosphates low and thereby keeping algae at bay
