Hello, I just bought a Beta yesterday at a local pet store. He was in one of those tiny cups and I had a small 2 gallon tank set up and cycled so I brought him home. After careful inspection his fins seem to be outlined in black and I'm wondering if it is fin rot. The water parameters seem to be fine and he has been in my tank for less than 24 hours so Im pretty sure if he does have something wrong he came this way from the store. I don't know much about betta fish but I want to make sure he is healthy before getting him into a bigger tank where he would be harder to treat.