QUOTE:
"When mature, the parasite breaks out of the cyst and after some time as a free-swimming form encysts on any suitable substrate such as the sand or rocks and divides many times to produce the infective forms (Colorni, 1987). The infective forms must find a suitable host or they will die. "
This may be a silly question, but if the parasite needs substrate or rock to survive, then wouldn't just putting the infected fish in a tank with no substate rid the ick after the cycle completes?