Do you have any phosphates? You might need to add a DI to your RO water. Also, how does your skimmer preform? Any means of nutrient export beside the skimmer such as a refugium?
That does look like an awful lot of bubble. I would get aggresive (daily) with your manual removal then try to work on nutrient export.
Cutting the lights might put a band-aid on the problem but is not a cure.
