Hi, my brother Inlaw brought a fish tank and emptied it out in the backyard . My 15 months old and 3 years old went outside and I found my son spitting something out. So I looked and saw a piece of glass, I cleaned his mouth and then looked and found a fish tank aquarium with the Mercury ball broken. It s really warm outside so most the Mercury was in the tube still. I m worried about any little pieces of glass he could have swallowed that I missed and the Mercury. I know thermometer Mercury isn t harmful. But is it the same as fish tank thermometer? What simptomes should I look for?