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If there is no visible bump or cotton like growth, and the fish's skin is simply discolouring (whitish) particularly around the mouth or sides. Then they have tetra disease, and there is nothing you can do to save them.

It is highly contagious and spread by touch so you should remove all fish that have discoloured as they will die within a few hours to a day from the onset of the discoloration.

This is a horrible disease about which not much is known and it seems to affect only tetras, particularly cardinal/neon tetras.
 
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