Red eye tetra problem
 

I have three red eye tetras and their mouths look really wierd; like part is missing. The other fish in the tank are not aggresive towards them as far as I can tell and all of the other fish are healthy. The tetras are behaving normally and eat but can anyone tell me what is going on with their mouths?

I'm no sickness expert here but could it be cotton mouth disease? Here post #11 http://www.tropicalfishkeeping.com/t...es-8179/page2/