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So two weeks ago my betta Gatsby died. I've had him for a long time (about 3 years) and he was just old. I didn't really plan on getting another but I went to the pet store and I seen a betta that caught my eye and I knew I had to keep him. The first two pictures are Gatsby and the last two are...

So I noticed this spot on my betta and I decided to do a big water change and raise the temperature to rule out a bacteria and ich. I added aquarium salt to the tank too. He hasn't been itching or acting weird or lost his appetite but the spot is still there. I'm not sure if it's fin rot but...