I've had that talk many times with her now. She just tells me "I know, I know! Stop telling me!" And after the bucket went 'missing', she started trying to guilt me about almost everything. Ridiculous stuff. Like that I didn't drink any of her weight loss drinks (I'm already about 10 lbs under weight and am trying to gain, not lose), that I dont ever eat any of her 'diet' snacks, that I won't take her prescribed eye drops, that I don't pay enough attention to the cats (I pay plenty), that I'm not at home enough, and so on.
Better for me to be harassed then my fish!
I also set up a little barricade thing around the fish tank so she can't get to him as easily.