Visual Signs:
* Frayed or ragged fins: This is the most obvious sign. The fins will appear torn, shredded, or have a "melted" look.
* White or cloudy edges on fins: The edges of the fins may appear white, gray, or cloudy.
* Redness or inflammation: The base of the fins may be red or inflamed.
* Holes in fins: In severe cases, holes may develop in the fins.
* Missing fins: The fish may lose parts of its fins.
Behavioral Signs:
* Loss of appetite: Fin rot can make your betta lose interest in food.
* Lethargy: They may become less active and spend more time at the bottom of the tank.
* Clamping of fins: The betta may hold its fins close to its body.
* Rubbing against objects: The fish may rub against the tank walls or decorations.
* Increased respiration: You may notice the betta breathing more rapidly.
Other Signs:
* Cloudy water: The water may appear cloudy due to the bacteria.
* Presence of white or gray fuzz on the fins: This could indicate a fungal infection as well, which often accompanies fin rot.
If you suspect your betta has fin rot, it's important to act quickly. Isolate the fish in a separate quarantine tank, and begin treatment with a suitable antibacterial medication. Also, improve water quality by performing frequent water changes, adjusting the temperature, and using a filter.
Remember: It is best to consult with a veterinarian or experienced aquarist for diagnosis and treatment recommendations. They can assess the severity of the infection and recommend the most appropriate course of action.