I've trained my Betta to come to the top of the tank for food whenever I knock on it. He would always come to the top and eat as much as he could. I went downstairs this morning, and knocked on his tank. He didn't come up. After knocking a couple more times, with no response, I moved the decoration that he normally hides in. He was dead, covered in snails. I don't know what was wrong with him. I fed him 3-4 times a day, and I did %90 water changes on his tank twice a week. I would post a picture of him, but I had none of him before he died, and he's so disfigured after what the snails did I'm sure someone would lose their lunch if they saw him. I'm going to miss him. He was beautiful and had so much personality (for a Betta).