Algae Indentification and Help Please

[ScubaGirl]

Sorry, this has to be quick. I'm heading out for a night shift. I'll be back on here tomorrow after I sleep.

My tank was mature with the previous owners (not sure exactly how long), then moved a block down to our house. It's been set up at our house for a year and 3 months at this point.

Yes, there are some areas with greyish/pale "fur" like areas with tiny bubbles attached. Not a lot though that I can see. We leave the back wall alone for the most part to try to encourage our urchin to eat that coraline algae rather than off the rocks.

The only thing new the tank recently is 1 fish and 9 corals. Tank is 75 gallons. Water was pristine 6 weeks ago.

CUC: astrea, turbo, and nassarius snails; sand sifting star fish; one conch; one tuxedo urchin; and one each cleaner shrimp and coral banded shrimp.

Again, thank you!!!