Hi! I recently fed some black ants to my droseras and i was surprised that most species (peltata, pygmies, rotundifolia, anglica, burkeana, etc...) suffered harm to their leaves and they died (of course ants escaped). Here is an example of d. anglica (note the dead new leaf):
Now is it the effect of formic acid ants sprayed on leaf in order to protect themselves? Has anyone similar experience?