I have a theory as to why Vibrant works for some tanks but causes problems in others. As mentioned earlier in this thread Vibrant acts like a fuel for nitrate burning bacteria similar to carbon dosing (vodka). When the tank is very low on nitrates the vibrant acts as a fuel for other bacteria like cyano.
So when you have high nitrates and this is the cause for the hair algae, Vibrant reduces the nitrates hence reduces the algae growth. But there are many reasons for algae growth and high nutrients is just one of them.
I have had a similar experience with vodka dosing before on a tank with very low nitrates.
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