Well, it has been several months, but the little monsters finally bumped the smallest one off. It hadn't grown at all, while the largest had doubled in size.
The "middle child" is now taking a beating and has been scared into hiding.
I'm not a fan of these fish at all. They're nasty to each other and aren't interesting at all. I should have just given them away when they were done their stint in the HT so someone could cycle his/her tank with them.
(insert pouty face here)