Some kind of white mold or fungus started growing on the surface of a half-filled gallon jug of rue tea. It was stored at room temperature for a couple of weeks and I figure I didn't use enough vinegar. The vinegar smell was gone, it still had a good rue smell, so it wasn't completely spoiled yet. It is for extracting, so I just filtered it out and added some vinegar. I still need to boil it down and do the salting and basing, so I'm not worried about it much. I'm trying to do a cwe-like extraction on rue, 2 gallons from 200 g so far, the third gallon will be boiled to see what's left. The second gallon is much more clear than the first, so I'm hoping that is most of the harmalas. The second gallon, with the ground seeds still soaking, is not showing any cloudiness or mold growth, so I must have put enough vinegar in it, I can still smell the vinegar. The gallons aren't sealed tightly, so maybe some vinegar evaporated.
My tea is very dark, with a very strong rue smell, but it was not yet reduced. I was surprised something grew in it, but apparently it is very possible. Rue is a seed, so it should have some sugars, or things that can be broken down into sugars. I would expect caapi tea being from stem might not ferment so easily, but I'll be more careful with all my harmala teas from now on.