Is my tank going to blow?

[tlaspec]

Hi,

I have a 46gallon marineland bow front tank for about one and a half years. Just noticed today that one of the front seals have a larger gap in the middle of the tank. On the other seals the front and side glass are very tight. There are no leaks on my tank and I can not seem to remember what it looked like when I brought it. I also notice that the tank is tilting slighted forwards, the bubble on the level just touches the line.



Should I be concerned about this or is this normal?