I just came back from vacation to notice several of my Neon Tetras have a patchy white appearance on their bodies. The one pictured is by far the worst. Some of the others have very slight amounts. Behavioraly they all seem to be eating and schooling. My water quality is pristine as I do 1 to 2 water changes a week. I did just switch my filtration from an FX4 to a sump...not too sure if that switch caused anything. My tank is a 75 gallon and heavily planted. I don’t want to jump to any conclusions but am leaning toward this being a Fungal infection and/or Columnaris. Last night I dosed some melafix that I had on hand. My plan was to get some Pimafix today and dose that as well. Any suggestions on the next step if the Melafix/Pimafix doesn’t do anything? I am particularly concerned about the medications adversely hurting my plants. Thanks!