Exclamation point rasbora tail rotting off

[andyb]

I just noticed one of my exclamation point rasboras tail looks like it is rotting off. 

Nitrate-25

Nitrite-0

Gh-150

Kh-120

Ph-7.2

Chlorine -0

 

Edited December 11, 2022 by andyb

[nabokovfan87]

Looks like it could be body rot, columnaris, or some sort of a spinal injury.  The tail is deformed. 

I would get some gloves (you don't know what it is) and try to get the fish out.  Clean any equipment used in that process and euthanize the fish.  For the next 2-3 weeks be sure to monitor the tank daily for white marks on other fish.

@Chick-In-Of-TheSea has a great thread about treating her nano fish for columnaris that might be of value to look back at. 

Very sorry about your fish struggles.  Take the time to make sure you have what need be and just go through in case you need it.