I was cleaning one of my tanks today and noticed that one of the neon tetras had a rather odd white spot attached to the side of its mouth on the bottom. Ive tried to get a snap but he's too small and it doesnt come out clearly.
I also noticed that he seemed to be a bit scraggy looking - his fins seem haggard and his body colour and eyes seem whiter than usual.
I soon realised about four of our neons look this way and another has a smaller white lump attached to his face as well.
Assuming it may be neon tetra disease ive been looking for odd behaviour or muscle weakness, but hey are all acting quite normall today and yesterday when i noticed.
I did a water change this morning just incase, but all the other fish in the tank are fine (2 clown loaches, 2 small balas, glow tetras, ghost danio and some flying foxes and a peaceful female gourami)
Is there anything else it could be?
Should i treat them with some methalene blue?