From my experience, the danger from dosing vibrant is if your nutrients are really low to start with. The heterotrophic bacteria in the Vibrant use rapidly the available nitrates to proliferate and overtake the algae. But you risk crashing a delicate system in these instances. I went through it after turf algae. Lost corals, saw Dinos take over. Took 3 months to recover.
Now I am dealing with bubble algae EVERYWHERE. Tried manual removal, made it worse. Emerald crab not taking interest.....So I am attentively following this post.
PS: After dosing Nitrates and Phosphates for a while, I slowly reduced the dosing until I stopped to find an equilibrium... which is Nitrates at 0.5ppm and PO4 undetectable, but corals looking nice and open. So I am dreading having to resort to Vibrant again..