This thread is about anemones that have bacterial infections that have developed resistance due to inadequate antibiotic therapy.
Drawing the conclusion that DD treats with antibiotics, and does so incompletely, based on, what, three or four specimens is absurd. I can think of at least a few other factors that may be the cause. As Peter notes, we don't even know for sure what kinds of bacteria infect these animals. Seems if the specimens were acquired within similar time frames that perhaps the particular infection was not effectively treatable with the meds on hand. Perhaps someone from DD will comment and end all this uninformed speculation.
Frankly I'm not even sure that a single, incomplete course of an antibiotic would be enough to cause resistance. I've seen folks here run two or three successive courses of the same antibiotic - surely that is even worse.
FWIW, LA animals are more likely to be exposed to low levels of meds than DD. Former come directly from Quality Marine which I believe runs non-therapeutic levels of copper in their fish systems. Who knows what may be in the invert systems.
Oh, BTW, my current mag came from DD!