I have had a 3" emperor in a 20G QT for exactly one week today. He is waiting to go into a 220G display tank. Sunday I noticed 1 white spot on his tail fin. It is still there today. I have also noticed a spot on his pectoral fin, but it isn't very easy to see. I only see it at certain angles when the fin is held away from the body, not when it is held against his body if that makes sense. I haven't noticed any other symptoms. No flashing, no rapid breathing, eyes are clear, and he's eating like a horse. My only experience with ich was a flame angel I had in QT. I remember him having a spot or two when first noticed and within a day he had many more. I'm thinking to wait this out to see if he gets more spots or if anything else changes before taking action. What do you all think? Also, if ich, how long would the spot on his tail remain before falling off. It's been on there for three days now.