I am fish sitting for a co-worker's betta. His name is Ted. He's large and has a broken fin. Part of his fin is shorter than the rest of the fin. I really can't explain it well. I have been putting Melafix and stress coat in his water for the past seven consecutive days. My questions: (1) Does anyone know how long it will be before I see some improvement? (2) How can I tell if this fin was like this at birth or broken later in his life. I know these may be stupid questions but at least I am asking them. Please remember I am a beginner so bear with me. Thanks so much.