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Agree - however - the question is always - what is the 'active ingredient'. Right? A small amount of QAC - is not the same as algaefix - with 4.5 percent. Most of this thread (Except the experiments done by @taricha) - are rank speculation. including mine - except - I've also got a BS in microbiology - and have both criticized and praised vibrant. My guess is that the amount of QAC in vibrant (despite @taricha's experiments - is not the same. There are many reasons for this opinion.I didn't see this either...
Whether QAC is the active ingredient or not is irrelevant to me. I want to manage my aquarium in a particular way. UWC pushing the bacterial component in their marketing without even listing QAC in their ingredients list is deceptive and has led to me adding something I did not want to use and taking a risk that I didn't realise I had taken and therefore wasn't considering how to manage.
@UWC I've tagged you a few times now and I certainly have not seen anything where you categorically confirm or deny QAC other than alluding to having the answer but not wanting to tell us just yet. Well I think now is the time to enlighten us.