I got my better two weeks ago. It a double tail half moon betta, i named him Charlie. Sad to say his fins started having tears on them, suspected it was one of the decorations so i took one of the decorations out. Then the tears started to become bigger and chunks of his fins started coming off. Then i figured it was the filter sucking up his fins so i stopped using my filter. I started treating him with bettafix but it didnt seem to help. I change do 100% water change one a week for a 3 gallon tank. I just changed his water today and added Api Stress Coat. Despite all of this, he's still very active and eats normally. I would say he's a happy fish but his fins are making me sad. Please help!!