Hey everyone I just got my first half-moon betta fish the other day at petsmart and I would say his fins have looked like this since it got him. He seems to be an older fish. I currently have him in a 3 gallon half moon tank with a filter and I'm getting a heater today. I have two small artificial plants in the tank and one real plant. Basically as a beginner I have no clue if his fins are rotting from poor care before I got him or if they're torn. Please help.