Looks like the same stuff I've been fighting for way too long now. Turbo snails don't touch it, sea hare didn't work, manually removing huge amounts of it didn't work, GFO didn't work, RO/DI filter didn't help. Running through some algaefix marine right now, just did dose #4, not sure if it's helping or not. I also started running biopellets about two weeks ago, too early yet for them to have a real effect. I MAY be finally getting ahead of it, but not sure yet.
Attack it fierce and early, if it's the same as what I have, it can totally over-run a tank in no time at all.
I have two options left to me that I haven't tried yet. "Special Blend" seems to be highly recommended (and I'm told very very smelly), the other is I may try some red slime remover to see if it's a cyanobacteria instead of an actual algae. If those don't help, it's going to be a total teardown and replacement of all rock/sand.
-Hans