Looks to me like Briopsis. It can be a nuisance and hard to get rid of once it spread, I must admit though it looks really pretty sometimes.
Lettuce Sea Slug or Lettuce Nudibranch (Tridachia crispata), will eat this pretty fast.
I had it in my nano and I just took the rock out, placed it in a bucket of aquarium water and scrubbed it really hard, it came back a little but I scrubbed it again and it was gone.
This is my one month old 65gallon reef (30gal fuge). All rock and corals were transferred from a previous setup. It contains about 80lbs of rock and branch and also 10 lbs of a cured coral wich is being use as branch. In the previous tank this alage didn't grow much, now it is growing pretty fast. I guess it's because the tank is still going through an alage cycle like you said. Will it be a problem if I place this rock in the refugium with some calupera??
Hmm. How to put this tactfully. Hrmm, I can't, so I won't try.
That stuff is EVIL
I tried scalding it with BOILING WATER and it didn't die. (process: stand next to pot of boiling water, insert baster, hold affected rock with tongs, squirt algae with fresh-from-the-pot water)
It will over-grow everything if given the chance. I'm just glad I opened that pic at work cause after getting some because it 'looked nice' I don't even want a picture of it in my house.
If I had it, I'd get anything off the rock I could by carefully fragging, then I'd place the rock in boiling water for no less than 10 minutes (that did work, but it took 2 months for the last of the boiled bits to let go of the rocks), then I'd either put the rock in a part of the tank where it will never see light again, or use it in a refuge or FO tank.
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