Sister threatening to kill my betta
So I have a 19 year old sister who still lives with mine and her parents. When she feeds my fish, the one in the kitchen (I have 2), she feeds him like half the container of pellets. I don't know if it's just because she hates me or she is trying to kill my betta. She has kept bettas before so she knows how to care for one properly. She got super pissed, pardon my language, when I ended up taking my betta's food container away from her. She started saying that he is just a stupid fish. He is just a 3 dollar fish. I can see her killing my fish while I am away at school. I have fear that she is going to kill my fish while I am at school. TBH I think she killed my other betta that I used to have. I came home from school and I saw him on the bottom of his bowl with his gill cover completely open. She is even saying things like are you gonna cry if your fish dies?. I am afraid that she will kill my fish. I have one betta in my room that I know is safe. If I had room in my bedroom to put my other betta fish in here I would. I don't have the room to do that. She is the type of person who would keep a betta in an inch of water or less because "it's just a fish." I swear I hate her guts! Can yall help me figure out a way to keep my sister from murdering my fish?