Could be an uneven stand causing the tank to twist, could also be a defect in the glass that just took that long to let go, I have seen a couple of virtually identical cracks and when the stand was checked for level, they were both found to have warped tops (both commercial stands) The foam underneath should not have made a difference, I as well as many others have used foam without issue. I don't know if Seastar has improved the build quality but I know the local shop quit carrying the line many years ago due to the failure rate. Hope you are able to get going again, you had a very nice setup, good luck and Merry Christmas.
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