ich
I have used cleaner shrimp and gobies in combination to effect an ongoing maintenance. In my last system I had a blue tang that would from time to time come down with ich, within a few days the cleaners would clean it up, or, the cysts droped off but did not come back. most of the time there was a stess factor or water quality problem, or new addition associated with the outbreaks. so, in addition to the actual treatment of ich, consider an ongoing maintenance crew if funds allow it. I am not an advocate of fresh water dips, so have no personal experience with it and would not want to advise based on others recommendations.