The other day i cleaned my Betta's Fish Tank. When i was done i realized that below the mouth the scales were turning a beige colour or it may have been white. I know this is bad i only clean his tank once a month but lately it was once every two months. I have a filter and heater running but the filter does not run all the time because it is too powerful for the tank and the fish. I do not have a kit for testing the water ammonia levels and the other stuff. Nothing is growing on the area. I need help!!!!