my green chromis had something that sounded similar. it looked like someone chewed a piece of marshmellow and stuck it on his side. i asked my manager and he said its not ich, cuz like fishyfanatic said..it looks like salt or sugar granules...he said what it was called. i forgot what the name was, but told me it wold go away on its own, i got a couple more opinions and they said the same thing, i waited it out and its all gone. some kind of fungus. but not saying its what your fish has, if its something else it could be fatal.