my fish has white stuff on it

Question
I recently got a beta fish and now it has white stuff on its body.
I was wondering how I could fix the problem?
I already changed 50% of its water.  

Answer
Hi Gracel;

Sounds like it could be a columnaris infection. Here are web pages about it with pictures and treatment options;

http://www.flippersandfins.net/flexibacter.htm
http://freshaquarium.about.com/cs/disease/p/columnaris.htm
http://www.aquatic-hobbyist.com/profiles/disease/freshwater/columnaris.html

I hope he feels better soon....

At Your Service;
Chris Robbins