I bought a 300 Gallon tank. Water Tested it tonight. After an hour I heard a huge explosion. It had literally busted by the seams. Luckily it was in my garage. It hit my car left a dent. Broke my 55 gallon that was behind it. Got everything in my garage soaked, and left glass scattered everywhere. I would say thousand dollars or more of damage.... The guy I bought it from said it was in great condition and had been up for 4 years prior to him taking it down 2 months ago...I'm at a loss of what to do now...Thank God My pregnant wife or I were not standing near it.