I dont know what to do. I woke up this morning to seeing glass at the bottom of my tank. There are no bettas in the tank yet do to the fact that I was trying to cycle the tank. I finally realized where the broken glass came from and it was from the thermometer that was in the tank. Should I discard everything in the tank like my sand substrate or just siphon the area where the glass was broken. Any suggestions would be greatly appreciated.