I have used 3 doses and nothing has happend.
I think it all depends on what kind of coral one has, how slow or fast one increases the Vibrant dosage to get to the desired level, and how high a dose is regularly administered. When I stopped dosing, I immediately had a cyano bloom. IME, whenever I dose a product, no matter what it is, I throw off chemistry in a way that causes a different problem to arise. Whenever possible, I try to find the root problem and fix that rather than put a band-aid on the problem by dosing.