I just got back from an all-day trip and noticed that my male betta, Riley, has some sort of growth on his anal fin. Is this some sort of disease? Or possibly some sort of scab?? (he had a slight tear in that fin around the same spot as the growth when I bought him about 6 months ago, but I haven't noticed anything before today)
I keep him in a 1.5 gallon tank with a filter, I have a heater that keeps the water in a good range for betta fish. I change his water every 2-2.5 like the filter package says. I use the water conditioner that the pet store told me to use.
I'll try to get a picture of it, but it is about the size of the head of a sewing pin, and the same shimmery dark blue of the rest of his fins. He has a normal appetite and normal energy level. Please help!!