Rummy Nose Not Using Pectoral Fin

Bluenose

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hello I'm hoping I can get some help. I'm new to fish keeping and I've got a 136 Litre planted tank that has been fishless cycled. Yesterday I bought 6 Rummy nose tetras which all appeared to be fine when they were released into the tank but this evening we have noticed one of the fish swimming strangely. The fish has a white area by its left pectoral fin and the fin itself is sticking out and unable to be used which means when it stops swimming it can tilt sideways. The area doesn't look furry like a fungal infection. Has anyone any ideas ? The rest of the Rummys look fine as did this one. There are 6 Cardinals in there too which are also ok. He ate his dinner today which was the first food we had given him. I don't know if he's injured himself somehow in the tank?
 
Fish can swim oddly and lose there balance with a damaged fin.
Sounds like the fish shop might of damaged the fin when they caught it.
The white on the fin does it look like bleaching beneath the skin.
Any signs of flicking and rubbing against objects in the tank.
Any laboured breathi
What was the ph of the tank to your fish shop.
 
We found our Rummy had passed away this morning we've fished him out and are taking him to the fish store for analysis. : (

There was no sign of rubbing like there might be in Ich but yes he did seem to have more exaggerated breathing than the others. The white spot was very bright all around the fin, the fin itself looked white I think because it was closed. The only way to describe the fin was that it kinda looked shrivelled and closed not spread out like the fin on the other side but it didn't look shredded. We did a gradual acclimatisation from the bag letting the water get up to temperature and then slowly adding our tank water into the bag so that the fish could adapt to the tank water chemistry. The whole process took over 2 hours. The other fish are all doing fine and the Cardinals have no problems and I have been told they are particularly vulnerable to change.
 
Ok bless him R.I.P.
It could of been columnaris if there was no signs of flickiing and rubbing.
Columnris can go along the back and down the sides to form a saddle shape.
I would do a water change on your main tank just to be on the safe side.
 
Thank you. We've done a water change so its good to know we were doing the right thing and hopfeully I will get a diagnosis tonight. All the other fish are still swimming around ok so I'm hoping it was a one off and not something that will spread.
 

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