Algae or Dust?

[Eustace09]

I went to topless for a day or two, but also moved everything to a new tank with 80% new water, I'm unsure if this is algae or just needs a good cleaning

Let me know please it's bothering me a lot

 

[Eustace09]

I went to topless for a day or two, but also moved everything to a new tank with 80% new water, I'm unsure if this is algae or just needs a good cleaning

Let me know please it's bothering me a lot

I tried posting video but it's stringy

 

[vetteguy53081]

I went to topless for a day or two, but also moved everything to a new tank with 80% new water, I'm unsure if this is algae or just needs a good cleaning

Let me know please it's bothering me a lot

Unfortunately, these are dinoflagellates and likely due to nutrients being absorbed and at very low level causing Its biological deficiencies.
No light is first key followed by the addition of bacteria to overcome the bad bacteria allowing them to thrive
Prepare by starting by blowing this stuff loose with a turkey baster and siphon up loose particles. Turn lights off (at least white and run blue at 10-15% IF you have light dependant corals) for 5 days and at night dose 1ml of 3% hydrogen peroxide per 10 gallons for all 5 nights. If you dont have light dependent coral- turn all lights off. During the day dose 1ml of liquid bacteria (such as micro bacter 7 or XLM) per 10 gallons. Clean filters daily and DO NOT FEED CORAL FOODS OR ADD NOPOX
You can feed fish as normal and if doing blackout, ambient light in room will work for them