Fish diseases are broadly classified in to Bacterial, Environmental and Parasitic diseases. Microorganisms are present everywhere in the tank. However, the problem occurs when your Betta Fish is restless.
Betas are more prone to infection because of low resistant power. This causes a drastic change in their health and wellness that may result in death, if ignored.
Environmental diseases imply the surroundings, where your Betta Fish dwells. Adequate care and cleanliness of the fish tank help to keep the fungus and microorganisms away from your Betta fish.