My cat Pickles has been eating my fish food. I try to leave it on top shelves and out of her reach, but some how she always seems to find it. She has even found a way to get the top off. It act almost like cat nip for her, making her a little wonky. She even goes after the bits that fall from my hand as i put it into the tank. It is getting annoying and very expensive. Is this normal, and does anyone know how to stop this?