It may also just be his nose, I have several that has a whitish tip nose.
Medicating is stressful to a fish, I would not jump into medicating needlessly, Watch it closely and see if it develops into something, More times then not I think you'll find it's nothing or will clear up with good tank maintenance that fits your tank size.
Overly medicating in it's self can cause problems, Don't be so quick to put your fish thru the needless stress of medication.
Sometimes I have actually wondered if some people don't worry too much and jump to quick, thus causing a problem that may never have existed in the first place.
Last edited by Chicklet; 04-25-2009 at 08:16 AM.