So.. I am assuming that the bubble algae that everyone is battling is green? I have red bubble algae. It is round and very similar to the green. There are three differences, it is smaller, it is red, and it is much more agressive. My emeralds (two in a 29g) don't touch them. I can't even suck them off with a turkey baster. I sharpened a flat head screw driver and scraped them off. I know it is extreme, but so is the algae.
"Music is the biggest gun, because it save. It nuh kill, right? The other gun lick off your head!" Bob Marley