bubble algae can look cool at first, but can rapidly grow to nuisance proportions. removign them by hand is probably the easiest way, however dont pop the bubble or you will release thousands of tiny spores, as this s how they reproduce. you can also try getting an emerald crab, as a lot of people say they eat bubble algae, however i got one specifically for this purpose, but he must be retarded too (my perc trys to nustle up to a mat of colonial zooanthid polyps) because all he does is munch on my live sand! what the dealie yo?? Anyway, let a couple grow cause they look kinda cool, but if they start getting outta hand, your probably gonna have to remove em!
good luck
jon