Rummy nose tetra with internal white mass

[KD12]

Just purchased 10 rummy nose tetras last week to increase my group in the tank and noticed 3 of them have internal white masses inside them. I’ve had rummy nose tetras for years and have never had this before with mine previously. Does anyone know what this is - should I be panicking as I’ve just restocked my tank?

 

[dudley]

Your pic isn't clear enough to figure out what it is. Does it appear to be solid or worm like?

 

[KD12]

Your pic isn't clear enough to figure out what it is. Does it appear to be solid or worm like?

It looks solid. In one fish it is a lot larger mass

 

[Mssmiles]

Hi, I was wondering if you found out what this is because we have a small school of 10 that we added about two weeks ago and a few are showing these same signs. We treated with Maracyn.