Congo tetra with white mouths.
From what I've read I understand that congo tetra are prone to mouth fungus however I don't know how to treat it. Opinion seems to differ as to whether this is a bacterial or fungal infection.
At the moment the fish are fine, eating well and their colours are great. I've only had them a couple of days and they came from the fish shop like this. Unfortunately, I didn't notice until I got them home!
Advice on a treatment plan would be greatly appreciated.