HELP FISH FUNGUS?!

[Messonaldo]

So I was looking at my bloodfin tetras today and noticed some white stuff on the mouth of one of the tetras.It is starting to stray away from the school and is swimming near the bottom of the tank.What should I do?

 

[fluttermoth]

Treat with an anti fungal medication.

Check your tank for any possible causes (so, is the tank cycled? Are you performing enough regular water changes? Are you fish compatible with your water and each other?)

You'll need to watch the fish closely to see if the medication helps; there is a disease called 'mouth fungus', that isn't actually a fungus at all, and that is much harder to treat, so if your fish doesn't get better with the anti fungal medication, you'll have to try something else (we can advise you on that, if needs be).