Yea. My rainbows looked the worst by far. My ram was second but my angels and pleco looked the best out of them allI made the same mistake many years ago back when you had to age your water to get rid of chlorine and I had used the wrong water on one of my 6 tanks. I realized my mistake a hour later when I saw I lost a couple of my fish, others lived for several months afterwards. In your case the exposure is much less so hopefully the damage is too. Some fish can handle the exposure better than others.