What would you do?

[Grizzly]

If you suspect one of your fish in your community tank possibly has the very beginning of ich what would you do? Try to remove it to a quarantine tank, treat the whole tank or wait to see if it gets worse? Currently it’s the only fish I see it on and do have ich x . 

[lefty o]

if you see one fish in the tank with ich, the whole tank has ich. treat the tank. id watch the 1 fish for a day or two, keeping an eye on the others to make sure it is ich. no point in treating for ich if it isnt there.