One time I saw my mantis shrimp Oatmeal punch the glass thermometer in her tank. I'm not really sure why she did it and I've never seen her do it since and I never thought of it again until today when it just occurred to me - what if she had shattered it? I'd have toxic mercury leaching out into the water! It's only there as a visual backup for the Inkbird temperature controller anyway. I wonder if I should replace it with an external digital one?