I've performed my own experiments on the particular "brand" of bubble algae that I have.
I kept a rock that was partially covered with it in a 10g tank, pure water, loaded carbon filter, completely dark for 5 weeks and it didn't even phase it. Even most of the mushrooms on the rock started bleaching and dying, but the bubble algae was still green and healthy looking.
Spores cause bubble algae. Good filtration, some emerald crabs, a rabbit fish, a uv filter, a good pair of tweezers, and a lot of persistence gets rid of it.
If your rocks are completely infested with it, it is easier to set your rock outside, let it "die", and reseed it with clean "live" rock than it is to get rid of it while in the tank.