My 125 cracked in pretty much the same fashion. When I cut the opening for the externals, there was a tiny little chip in the corner that stoopid me didn't even pay attention to. This was my nephew's very old 125 that was 1/2 inch glass, and had no braces. The trim was basically there only to support a canopy. The crack ran right from that tiny little chip down to the opposite corner, and just blew out. Having replaced it the next day, with a stock 125 with conventional bracing, and two hang-on overflows, I understand perfectly how you could be a little disappointed at the prospect of having a tank that's now "internally encumbered". I think it's just your choice, and if I had the time, and didn't have all that rock and livestock in buckets and containers scattered throughout the basement, I would've done it again. Yes, absolutely nuts. But I still remmber how that tank looked with no obstructions whatsoever.
But is it too to vote for the road trip to Nebraska!