Betta face turning white/not eating

[Janie]

My betta is not eating and his face is turning white. What could be wrong? Please help

 

[OrionGirl]

Some additional info will be helpful. What kind of setup is the fish in? How old? Temperature/tank mates? Have you tested water parameters?

 

[Janie]

He is in a small aquarium with an underground filter and a bubble air stone. It doesn't move the water much. I did do a water change Monday of a bit more than half. He is the only fish in the tank. I don't have a water test kit.

 

[OrionGirl]

How long has the tank been running? What's the temperature?

I see the color, but it doesn't look like an infection or disease. Bettas do normally change color as they mature. The drop in eating could be related to temp--I don't see a heater in the tank, and the domestic bettas definitely prefer warmer setups--78, at least.