I really need help. My beta likes to swim near his filter which he’s always done since I got him. One time he got stuck on it and I went to move the filter and he swam right off. On Friday 5/27 he got stuck on it again. His tail was stuck inside the filter and he was wrapped around it. I had to turn the filter off to help get him out. After that I kept the filter off because I had to go to work and was afraid of turning it back on. But he would stay at the bottom of his tank in the corner. The next day I went and got him some betta revive to help and put him into a temporary 2 1/2 gallon tank until he was better. Today (3 days later) he’s swimming around at the top of his little tank and he still won’t eat which is probably because he’s stressed but what I’m more concerned about is when he swims it’s like he’s shedding his tail. He’s losing pieces of his tail and I don’t know what to do. The pet store is the one who told me to move him into a small tank and get the betta revive. Is it normal for him to be losing some of his tail after something like this? He had a big fully complete tail and now it looks like this. Someone please help me. I’ve had him for almost a year now and I don’t want to lose him. His name is McFish and he’ll be 2 in august. I don’t know how old he was when I got him I just count the years I got him as his age. I also included a picture of the medicine I was told to use.