In the process of setting up my ten gallon. I had the gravel and some decorations set up, then I stuck the thermometer in there on the side. It had a suction cup, so I figured it'd be fine. Walked out of the room for a moment to get the other stuff I'd just bought and the thermometer is laying in the gravel, broken. But, it was just the bottom of the thermometer that was broken. The little metal beads are in the gravel now, and i'm wondering if those little beads could be toxic or harmful to my betta. My mom suggests that I throw out the gravel and buy some more but I want to know if the metal beads could be harmful, and I should buy new gravel.
That's the thermometer I bought.