Update to alien growth phenomena:
As you can see upper part of screen is growing nice green hair algae. Rest of screen is all covered in " alien" growth. It looks semi transparent at the moment. Possibly its because screen was cleaned not so long ago and it will gain "nice yellow" tint as it grows thicker. As growth progresses , hair algae becomes longer too and covers more and more of "alien". But most of it is attached to upper inch of screen and seems cant compete alien anyway.
At the same time I have got some another alien type algae in display :
Looks like white fur to me.
But as most corals are happy, I try to stand that :
P.S. Screen is under 6 red and 1 blue LED. All at 1w. size is 4x6