I think you should get the biggest UV sterilizer and run it 24/7. I can’t tell you the name of your algae, but it is spreading thru the water column. Have you used a turkey blaster. Is it slimy to the touch. There are many differrent color cynobacteria.
This is a good link on nuisance algae, but does not identify what you have.
https://www.reefcleaners.org/nuisance-algae-id-guide
https://en.m.wikipedia.org/wiki/Golden_algae
Very nice finished carpentry worrk. Your tank will standout with the way you designed your room