Does my aquarium fish have a disease?

Hello everyone! Maybe someone can help me. I got some blue Peruvian tetras for my tank today. It wasn't until I got home that I noticed that one of my friends had a dark spot on its left side and its intestines were brighter. Upon closer inspection, it was duller than the others in the tank and was swimming in circles in only one area of ​​the tank. It was eating, albeit hesitantly.
I've googled possible diseases, but I can't really say for sure whether it could be harmless or malignant. It seemed similar to fish tuberculosis, so I put the little one in quarantine for now. Do you know what it could be and how I should proceed? Thanks in advance!

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Norina1603
1 year ago

Hallo ,

auch das sieht eher wie eine mechanische Verletzung aus, die bei sehr guter Wasserhygiene von alleine abheilen sollte! Ist Dir das in der Verkaufsanlage nicht aufgefallen?In der Regel beobachtet man Fische die man kaufen will sehr lange und bei Auffälligkeiten nimmt man vom Kauf anstand!

Norina1603
1 year ago

Wenn es ein geeignetes Behältnis ist, schadet es ihm jedenfalls nicht, ansonsten glaube ich nicht, dass es ansteckend ist.