whats with my betta's tail?

[texasfish]

Hello all, I have a betta in a 1g undergravel filtered tank. Recently he developed a weird red bump on his tail. It looks kind of like a blood bliter, or a zit. The flesh seems stretched until smooth and shiny. The strangest thing about it is that it comes and goes throughout the day. Should I worry?

 

[Devilishturtles]

What are your water parameters and when is the last time that you changed the water in the tank? Just to start with....

 

[texasfish]

water tests normal, pH is a little high, but it always is. Last water change was 3 weeks ago, I added a small amount of stresszyme to the new water at the time of change. Fish is acting normal.

 

[Menagerie]

Have you noticed anyone picking on the betta?

 

[texasfish]

No, he lives all by himself

 

[Menagerie]

Sorry, it wasn't in your sig. (I saw Barbs and panicked!)
Is there a certain timing with the appearance/disappearance of the bump?
How long have you had this betta?

 

[bettacove]

Is there anyway you can get a pic of it?
I would be doing more water changes, at least once a week for a 1gal.

ashley