I had these in my tank. I read somewhere to just pick it off. I just hand picked it off the rock. If you wait until it turns a dark green almost black the bubble will be harder. Then just gently roll it off the rock. Gently! It should just pop off, without much effort. On smaller ones its more difficult and I've actually had a few burst in my tank. I didnt notice a growth in "more". I did notice that by doing more water changes more frequently it reduced it drastically.
I have a JBJ 24 gallon. Filled with corals, and 2 fish (flame angel and blenny).
Before I was feeding 3 small portions a day. Now I alternate 1 and 2 feedings every other day.
Previously I was doing 2-3 gallons twice a week. Once I had the bubble algae problem I did a 5 gallon change. Followed by a 3 gallon change 2 days later. Followed by 3 gallon change 2 days later agaom. Then another 3 gallon change 5 days later. Then I did 3 gallons every 3 days for 2 weeks. Now, I'm doing 5 gallons on Mondays and 3 gallons on Fridays.
Once in a while I'll get the bubble algae, but not anything like I used to. Before it was totally out of hand.
Oh yah, I also added a really small powerhead to help with circulation. I think it only does like 44 gph. I got it for like $8.