I’d use Vibrant for bubble algae. Crabs will pop the bubbles and may possibly spread the spores around the tank.
There was once a veteran reefer that I visited locally. He had bubble algae, but only very few “large bubbles” here and there. I told him that when I had it... I went through the tank weekly popping the bubbles and trying to get it off the rocks and it went VIRAL. I ended up shutting that tank down behind it.
He then told me If you keep nutrients low that it will not spread. This is fairly true. However, he then proceeded to pop some of those big bubbles to prove to me that there was nothing to worry about. 1 year later I visited that same local reefer again. His tank was loaded with bubble algae in between and on all of the rocks, around the base of his acros, sump, and you name it. Could be a coincidence, but I never want to find out. I’ll never pop a bubble or let anything else pop one either. Vibrant will kill it, but it’s a long slow process and nutrient levels need to be monitored closely.