Problem with black skit tetra

[CassCats]

you know, I'm wondering if possibly could be bruising. Perhaps got into a brief spat or swam into something in a panic... im not sure if fish bruise or not like this, but its a thought.

If ammonia is 0 and nitrite 0, that's ruled out....


Another thing to consider, searched and found this:

Black warts on Betta help!

my Betta recently started getting raised black growths - look like warts all over his body. This happened after I gave him dried blood worms as a treat- read in another forum to do. It may have nothing to do with the growths but ? He is acting normal but the growths have multiplied all over. I...

www.fishforums.net

 

[Fishmanic]

For the last week or so, I have been treating as Colin advised. If I lose him, I cant say I didn’t try.

 

[mbsqw1d]

I wouldn't want to jump to any conclusions, and I only offer a possibility as to the cause.
Black widows are one of the fish prone to TB, and one of the symptoms is black areas of tissue

Fish Tuberculosis

nathist.torrens.org

Again, not saying this is what it is, but just worth a read through (if you're not already familiar).

I had Colombian Tetra develop black areas of tissue (internal, so not ammonia burns...), however they also developed the tell-tale curvature of the spine.

 

[Fishmanic]

An update
Found the Black Skirt tetra dead today. Oh--well..at least I tried to cure it without affecting other fish. Other fish are fine...that's one good thing.

 

[mbsqw1d]

An update
Found the Black Skirt tetra dead today. Oh--well..at least I tried to cure it without affecting other fish. Other fish are fine...that's one good thing.

That's a shame, glad you can stay positive about it

 

[CassCats]

Sorry to hear. Fingers crossed it was only that one who was affected