Continue to dosing your EI, it's still a CO2 or flow related issue as are most algae problems, are you sure you're not getting any dead spots, and have you tried moving your drop checker to ensure CO2 is reaching all areas of the tank, yellow on your DC is not good, you are using 4DKH water right? You need consistent CO2, lime green is the aim, fluctuating levels will trigger these hair and fuzzy algae's.
Definitely not blue green algae. It just looks like some sort of hair algae.