Help Started A Few Days Ago

[goodd2000]

I had three rainbow fish one died and the other two have this white stuff on its mouth. What is it and can it be cured? Could it be spread from fish to fish.

 

[Blondielovesfish]

Sounds like cotton mouth, does it look similar to this?
 

 
 
 
 
 
If it is cotton mouth, melafix would probably be one of the best treatments.