The past 3 days I have been finding my mystery snail flipped over on it's back. I've had to use my net to put it right side up. Is this normal behaviour? I've only had my snail for a week or so and I'm not familiar with their mannerisms, this is my first one. I'm concerned that perhaps my fish are picking on him and he's being flipped over. Does anyone know what is going on? Any advice is greatly appreciated, thank you!