Our male Betta has developed white spots on his tail. There are no spots on his body. He is the only inhabitant in a 10 gallon, filtered tank. He's almost 2 years old and has seemed healthy and happy until about a month ago. He's been slowing down, and spends more time "hiding" in the foliage in his tank than he used to. I attributed it to old age, but now that I see the spots, maybe he's sick. Help?
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