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?
/www.flippersandfins.net/flexibacter.htm