Betta With Shrivelled Fins

[lrhodes]

My bettas fins seem to be shrivelling around the edges. It doesn't look like any fin rot I have ever seen... and I am wondering if maybe they are just like that... or if it is a result of the "medical bath" my son gave him. (For anyone who didn't read or does not remember the story: my son poured an entire bottle of ich medicide + an entire brand new unopened bottle of pimafix into the 5 gallon betta tank.... I'm pretty sure he died and came back to life.) Well that was several months ago... and I don't know if it would have effected him permanently?

http/m.flickr.com/#/photos/102865796@N07/12156662085/in/photostream/
Here is a picture. Not a very good one......
Do you think adding a little aquarium salt, after a good water change, will help?

 

[Lillefishy]

Some bettas bite their own fins he could be doing that.
Keep the water pristine & keep an eye on it

 

[lrhodes]

Its been like that for a while. A long while. And he acts dine. Eats swims around. Doesn't seem sick at all.
And its not just his tail fin. Its all of them.

 

[ficklefins]

I've been told that if a betta is kept in hard water, sometimes their fins will curl at the ends.  Apparently it's a lot more common in crowntails, which is what I noticed it in, but it can probably happen in veils too

 

[lrhodes]

Hmm.... well that would make since considering our water is pretty hard.
Does it harm the fish at all?

 

[ficklefins]

The particular article I read on it said that there didn't seem to be any harmful effects other than the tail "shriveling". If it makes you feel any better my crowntail that has a slightly shriveled tail is almost 4
I can't find the exact web page I read but this one is very similar, probably the same author or taken from the same care sheet:

http/velvetdragon.com/bettas/caresheet.html

It says: "A high pH or hard water will cause fins to curl, particularly in crowntails, which are particularly sensitive"

 

[majerah1]

Fin curling is usually an issue with the hard water, though not always. 
 
Also note, please do not use the pima/ mela/ betta fix on bettas or other anabantids. It is a type of oil that coats thier labrynth organ and causes breathing issues. I do not think it is the issue you have with the fins. 
 
What is his water parameters? How often do you do your water changes?