I had bubble algae really bad but overcame it with time and nutrient control. Whenever I did a waterchange I'd suck out bubble too. The best best is to reduce nutrients and give it time. Now that I've been feeding heavily it is starting to come back though.
You can hear more about from me....I caught my emeralds at night eating up my acans as well.....quite strange, people say I needed to make more food available, but there is plenty of bubble algae.....my poor acans about bit the bucket, and it was hard catching that little bugger....into the sump he went!
but the emerald crabs break it as they eat it