A week ago my first betta suddenly died I really have no idea why he died. At first I thought it was a freak accident with heater, but now I'm not so sure. He may have been sick, since he was really lethargic a few days before passing. I do want to get another betta someday, however, I'm not sure what is the best way to clean my tank? I read several people recommended regular bleach to sanitize the tank, however, would that be safe to the fish? Or should I just use vinegar? I looked around and found this article: If I followed the article, would that be okay? I planned to rinse it 8-10 times and then overdose with prime just to be safe. I have also boiled and cleaned my gravel with vinegar, is that enough?