Rummy Nose Tetra - is this Columnaris?

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an780

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Hi Experts,
Got a new set of Rummy nose tetras yesterday from my usual reliable LFS. 12 hours after introducing into my tank I am noticing a white dorsal fin on one of the Rummy nose tetras. Behavior And activity levels seems fine. No. I didn’t quarantine. I know I should have. Is this saddle back disease or columnaris? Or some other fungus?

All other inhabitants also seem fine.
 

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A201

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Looks like Columnaris to me. Be a good idea to remove the infected fish asap. Do a 50% WC & keep a close watch on the tankmates.
 
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an780

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Moved to quarantine tank. Fingers crossed.
 
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