Can saltwater fish get freshwater ICH? I have a few tangs and some butterflies and I am doing hypo on them all. I also have a lion that will only eat live fish. Well the salinity is down to 1.009 and has been for two weeks. When I feed the lion, if he misses the gold fish they last forever in that low salinity. All of my fish had IHC witch is no big deal, I have ran hypo a million times. My wife went to Wal-Mart and got 5 gold fish that were covered in freshwater ICH and feed them to the lion thinking that saltwater fish can't get it. Well none of them did but, I have one butterfly that is covered in what looks like ICH and I don't know what it is. It can't be ICH, I have had hypo going for two weeks and no sign of it on all the others. They are all very happy and healthy. So what is going on? If it is freshwater ICH will it go away when I raise the salinity?