I don't know what your others had, but it does SOUND like it still may be black ich. Could the hole on it's side be from this flatworm attaching itself?
What is Black Spot Disease?
Also referred to as Black Ich, this saltwater fish disease is caused by a small parasitic turbellarian flatworm in the genus Paravortex that takes up residence in the aquarium substrate. The adult worm attaches to a host for about six days, falls off into the substrate, then in about five days the adult body ruptures releasing a new population of young worms and the cycle begins again. It normally does not show up in the larger numbers as with other forms of Ich (Whitespot Disease and Coral Fish Disease) and is not nearly as dangerous. It is a disease that is fairly common with Yellow Tangs and Angelfishes, but can effect other fish species as well.
Symptoms
Black Spot Disease appears on the fins and body of fish as tiny black dots, less than the size of a pinhead. The fish will scratch up against objects in the aquarium and the disease may be associated with reddened skin, lethargy, color loss and rapid breathing. It is easily seen on light colored fish, but is less obvious and sometimes overlooked on dark colored fish.