I’m sorry, I’m a bit sleepy so not reading very well.
Bacteria are strongly differentiated and should not be generalised as harmful. We are dependant on a lot of different bacteria species. We can’t live without them. Saying acetic-degrading bacteria are bad because some other bacteria are, is like saying all fish are dangerous because you once stepped on a stingray. Indeed you don’t want Vibrio cholerae in your tank, but Nitrobacter are essential. What I’m trying to say is, the mily clouds are not necessarily harmful.
But I’ll look what happens in a testing tank.