That article really makes a stronger case for keeping DPs alone, as opposed to co-habiting a tank with other DPs. Its arguments against keeping DPs with other fish, even fast moving ones, we have already discussed and debated.
The main argument really is that fast moving fish that can easily evade puffers, will out compete the puffer for food. Which first of all does not address any compatibility issues, nor the saftey of the fish. Furthermore, I just simply have not found this to be true, and no matter how many times I read it in an article somwere online is it going to counter my own personal experience....if anything, I have found the puffers to be more aggressive feeders.
I would like to read one case of DPs attacking a Danio, or Rummynose or some other fast moving fish.......I havnt read one...all I have read and heard about are success stories...whereas shrimp are a gamble. As many folks have said, shrimp may or may not become food.....so why reccomend them? Why not reccomend fast movers who seem to have proven to NEVER become food.