I'm no pro, but here is my experience on the matter... my situation may not be the norm, though...
I had a lot of bubble algae in my tank. Most of them were pretty big, too. I bought an emerald crab and he did nothing for me. I bought five more (I needed them anyway), and they didn't do the trick either. So, I started bursting the big ones and pulling them out. This causes them to spread like wildfire, however, the emerald crabs were able to keep the little ones at bay, so bursting them wasn't bad for me. Now my bubble algae is 100% extinct.
So, what I guess I'm trying to say is this...
1) Get an emerald crab (or a few)
2) Keep pulling the big bubbles if they don't get eaten
3) Don't worry about bursting them if you have done #1
That's my 2 cents.
92-gallon corner tank, 100lbs of LR
, 140lbs of sand, 250watt 10,000K MH
, 110watts of actinic PCs, Mag 7 return, custom refugium, AquaC EV180 w/ Mag 5
Female lyretail anthias, eyelash blenny, tomato clown, saddleback clown, firefish goby, 2 sand-sifting stars