Broken Heater
The other day, my heater shattered. (The tank was empty at the time, so my turtle is fine.) I did my best to clean everything up and take away all the hazardous materials. But I couldn't get some of the black sandy stuff out of the corner of the tank. Is this hazardous to the turtle? Right now, he's not in the tank, but in a separate basin outside of it, because I was concerned about the black stuff being harmful to it. 