Alright, I probably posted in here before, but I'm too lazy to rummage through the last 9 pages, and The Daily Show's on in 5 minutes, so...
Once a month I give both my purpurea and my minor a drop of whole milk in one or two pitchers, and it's always done good for both of them. No rotting. Same with the ventricosa. I also give my primuliflora and adelaes a drop of milk every month, which also works well.. I used to use cheese for those two species, and it always worked well, but for some unknown reason, my current primuliflora takes a long time to digest the cheese, and the leaf usually rots, and with the adelae, it doesn't even try to digest it. It used to work perfectly, but for some reason, my current small hoard of dew-producing plants no longer likes cheese, so I resorted to milk, which works as well as cheese used to.