Help! white gunk on fish

[cheops]

Balloon Mollie has white gunk on left fin and top of head and upper back. What is it? Hopefully you can see the picture.

 

[vetteguy53081]

Balloon Mollie has white gunk on left fin and top of head and upper back. What is it? Hopefully you can see the picture.

These guys are susceptible to bacteria and fungus and are easily treated with Maracyn Two