Well i put a thermometer in the tank to make sure my water temp was where i wanted it. And i went upstairs to eat and when i went back down it was on the ground broken..One of my fish must have knocked it off the glass? So i picked out all the glass and those little metal balls. It looked like all the mercury(red stuff?) was still inside the little tube. Should i be concerned? My dad said it was fine but idkk Experts help me out please?