As you get deeper into the hobby, it will be crucial to use a camera to identify things. Don't worry too much about the algae this early on. Everyone battles it at first. Best advice on getting rid of any algae: use a multi-pronged approach! Like clean up crew, protein skimmer, water changes, brushing rock, maybe a little 'Red Slime remover' (I used it once), charcoal, phosphate absorbing media, and maybe a few algae eating fish or urchins.