difference between fin rot and fish damage?

[DeBowler]

for some reason searching fin rot comes up with nothing on here. One of my female guppies who had just a small piece of fin missing from her tail, now has another sizable piece of tail fin missing. Am I dealing with a fish domestic violence or fin rot?

[KingFisher]

What are the other tank mates? you may have a nipper.

If it is fin rot, the edges look all white and melty.

[~firefly~]

Can you get a pic up of it?

I've seen fin rot only in pictures but it tends to errode the thinner fins first (leaving the spiky parts sticking out...they degrade slower) if you can imagine what I mean?

Nipped fins tend to be nipped off in bites and can be raggedy.

[talldutchie]

And that nipping is rather common with guppies, especially with the males.

[DeBowler]

Was not fin rot. found her about a week ago dead, dunno why but the others seem to be doing fine.