Body Fungus (Columnaris)

Symptoms : White cottony patches anywhere on the body.

Info : Body 'Fungus' (aka: Columnaris) is a bacterial problem. I have also listed it under fungus because that is what it looks like and that might be your first reaction.

Treatments : Maracyn, Clout

Prevention : You can prevent by keeping your Betta clean. Disease may still be introduced by live foods.