HELP! Need to identify this algae bloom before it kills all my corals.

[DKoKoMan]

I'm struggling to identify these bubble things or algae. I have started a 3 day lights out period with the tank being completely covered. I'm starting to panic as I have only went though one bucket of AF Reef Salt and half of it was mixed with RC. I just bought another AF Reef Salt but I'm hesitant in using it...

I'm surprised how many others are experiencing this. Ditched IO RC as I wanted parameters more along the lines of NSW. Any other suggestions?