WOW!! Never have had trouble controlling ICH (been in the hobby 10 plus years). When it crops up start garlic in the food and should go away quickly. All fish have Ich and it is just a matter if they will break out or not. Cleaner shrimp in place originally can and usually will let nature run it's own course with very little help then needed by the owner. If you still have problems hyposalinity and slightly higher tank temperatures (obviously both done slowly) should take care of your woes.
Purple