Popeye is a common bacterial infection in betta fish that can cause one or both eyes to bulge and become cloudy. It is caused by the bacteria Flavobacterium columnare, which can enter the fish through the gills, skin, or mouth.
Popeye can be a serious infection if left untreated, and it can even be fatal. However, it is relatively easy to treat if caught early. The most common treatment for popeye is to use antibiotics. These can be administered orally or topically, and they are usually effective in clearing up the infection within a few days.
