Well a few days ago I was watching as my big snail latched onto my floating therm., I then watched it as it sunk to the bottom of my 46 gal
tank. A couple hours later I hear this craaack, and come to find my therm. floating and the snail on the bottom of the tank. No problem I thought, I just hook it back up bey the suction cups. Today I walked past my 100+ tank (same therm.), and notice water in the unit. Low and behold It busted the top when it hit the glass top of the aquarium. BTW
for all those who are concerned or even care. the beads in the therm. are actually steel shot not lead. If you bust one just get a magnet to get the beads out.