Diatoms
Cyano
Green Hair algae
Film algae
Coralline algae
The intensity of each bloom depends on water quality (available nutrients) lighting, whether you used dry rock or live rock. You may miss cyano or green hair algae depending on the specifics of your tank.
That looks like either Diatoms, which will pass once the silicate levels drop. Could be Cyanobacteria as well, but most likely Diatoms.