Exploding tank

We had a disaster this afternoon. One of the 125's exploded. It has been in the same place for over a year.

Here's our hypothesis:

1. The place where the break occured was where the heater was. At the base of the heater is where you can see a small crater and the cracks shot off from it. Could the heat have weaken the glass????

2. Next door a Lowe's is going in. Lots of small earthquakes caused by the construction. We've had things falling off the shelves.

Anybody want to make a guess to the cause. It was definitely a disaster.

If you think it could be caused by the construction........is there anything we can do. We have 3 other 125's and 6 55's that I'm worried about. Lowe's hasn't even started pouring the foundation.

The tank is in my friend's pet store. I am his volunteer help and guinea pig. I test things out at home and do the research. The store has only carried freshwater fish until recently.

There was only a huge arrowanna in the tank. A customer could no longer keep it in their tank, and the store took it. He's a store pet now. He was cut up some, but seems to be doing okay.

The water damage was another issue. The tank was a top tank which could allow for swaying with the construction going on. Luckily someone was quick enough to cut off the circuit breaker before water got into the outlets.

The tank was level when it was installed. Before we install a new tank, it will be checked again in case settling occured after construction of the stand.

Thanks for the replies.

The foreman is going to be contacted. They tried yesterday, but he was not there. Clean up is finished, and the arrowanna now lives with a big catfish. So far, so good!

Not a one. The only thing we were thinking of was keeping the water from leaking into the other stores. Pictures never entered our mind until it was over.