Thanks all!
No rock slides the glass just failed. 3 year old tank so no reason to go to red sea.
What I'm going to look hard at as I get to it is the stand. This goes back to the wood deterioration I saw and asked Red Sea about a couple of months ago. They said the stand was never meant to have a sump in it. While I've kept it dry I've had a few spills over 3 years and i know my tank has been just a little off center level over the last year. I was just about ready to get the wood for my new stand. I'm going to look toward tank level change with the stand problems, its possible it has shifted just enough to stress that front corner. I'm also wondering about this fromt right corner, it seems like every failed 250 tank members have posted this year and last all cracked in that corner.
I'm not quitting this hobby or here, this hobby overtook everything else I did except work, I enjoy it far to much to quit. But, I'm going to enjoy the break in my elecric bill LOL. While no one wants this to happen it's opened the door for the larger tank I've wanted for some time. I'm just not in any rush to get there right now. I've got around 20 to 30 gal of water in my carpet and all the problems that brings to deal with first.
Thanks again!