Help , black skirt tetra

[Aquariummom]

I have two tetras in a 20 gal tank , I’ve had them for four years now . I came home and as you see below it looks like the fin was nipped but there’s what seems a growth or clot. Has anyone seen this before?

 

[JuiceBox52]

Not sure what this is. Hopefully someone will be able to help! Do a 50 percent water change every day to help prevent any infection on top of this. Good luck!

 

[Barry Tetra]

What do you feed him?

 

[Colin_T]

its a blood clot in the fin. the fin was either damaged or might have a minor infection.

do a big water change and gravel clean the substrate every day for 2 weeks.
make sure any new water is free of chlorine/ chloramine before it's added to the tank.

monitor the fish for secondary infections (fungus will be white and fluffy, bacterial will be red and inflamed - similar to what it is now). it should get better over a couple of days. if it gets worse then post new pictures.

 

[Aquariummom]

What do you feed him?

Just tropical flakes , there not a fan of bloodworms .

 

[Byron]

The fish in the photo is a male Diamond Tetra (Moenkhausia pittieri), not a Black Widow Tetra (Gymnocorymbus ternetzi), just so you know.