Hi guys,
I just checked the screen and here's what I got. Date: 15th May 2017.
Not bad I guess. Probably I'm seeing this kind of algae because the tank isn't matured yet and so I won't see hair algae or whatever else.
The tank was recently stocked (6 days ago) with 2 fire fishes, 1 royal gramma, 1 black cap and 1 jawfish. So I guess the feeding helped the algae grow.