I have used lugols and brightwell aquatics medicoral. I had bubble algae breakout one time. With a combination of tactics including smaller Emerald crabs. I recommend smaller as they sometimes will try to go fishing in your tank if they get too big. I also would create 3 trays of saltwater, one with lugols. Use a scalpel to carefully scrape bubble algae off without breaking bubbles in first bin. Then dip in lugols then in clean saltwater. Repeat until clean.