One of my fish has been doing that but I figured out it was because he was new. How long has your red been in there? Email me or tell me this info.
The age of your red
What is the temp. in your tank
How many fish are in your tank
Also if you dont get a good enough answer here you can go to
http://www.aquariumfish.com! Sign up it really is a great website. My name on there is oscargirl093. I have two people that normally post on all my messages. Hailey and goldlenny. Please try that website too. But keep in mind to check back on this one too.