Agreed. Brooklynella, to be a bit more precise - at least to look at it. Are the fish exhibiting any behavioral symptoms, such as rapid breathing or hovering in the flow of a powerhead?
You'll want to crank up a quarantine tank, and a couple of dips; four or five minutes in aerated freshwater of the same temperature as the tank can give some quick relief, and a longer dip in a medicine with formalin (Quick Cure, etc...) or Acriflavin (Ruby Reef Rally, etc...)