Help ID this stuff!!

[sfg]

So I had this algae pop up awhile back. It has the consistency of cotton balls, grows in a tight knit fashion. Almost looks like green balls of clouds when left alone. This is not hair algae and not turf from what I was told. Nutrients in my tank were zero'd out. The picture with me holding the stuff was what I ended up pulling out with my finger tips after 1 week. This was me doing this week after week. I Tank is about a year old. I ended up pulling my corals and doing a 2 week black out, tank completely covered. After two weeks, while it didn't grow, it was not dead. I did spot treatments of 20% peroxide which ended up killing it all. A timely process of only 12ml a day. Fast forward 2 months and it's coming back. I have my corals back in now and lost a bunch from the last go round.

The only natural predator I found that ate it was tuxedo urchins. But with 7 in a 120 they couldn't keep up with the growth rate.

I tried flux RX and this did nothing to it. Dosed at the recommended rate.

Any help would be appreciated!

 

[NeSsyAqua]

Thats hair algae. Whats your nitrate level at? And have u tried getting a sea hare? Had this kind of problem before and seahare ate all of it.

 

[sfg]

I dont think its hair algae. This stuff is thick. Wont come off with a brush and very short. I have hair algae in my sump and its long and easily pulls apart by pulling it. My tangs wont touch this stuff. They will go after hair algae when present.

Nitrates were zero'd when this happened last time. AT the moment I am keeping it between 5-10ppm