i just finished cleaning my 10g feeder tank it had no cracks at all or chips i filled it with warm water so the heater wouldnt take as long to heat the water i see the tank a minute later it has a 1inch crack on the tank so i go to get a bucket and when i come back it went to 2inch i watched it and it slowy went to the top of the tank with a loud pop
idk why it happened im guessing cold air warm water has this happened to anyone else 
idk why it happened im guessing cold air warm water has this happened to anyone else