ouch that is a nasty looking hole too.... I'm guessing you haven't water tested the tank yet?
nope just gave it a clean
i sent pics to the shop, they are going to send someone down tomorrow to assess it, i might squirt some water into the corner and see what happens but at a educated guess i say it wouldn't leak now but might fail in the future, at which point it could be a catastrophe..
I'd pref a tank swap-over personally, not really keen on doing fixer uper on a brand new tank that cost that much
I can touch the back glass with a screwdriver tip down the back of that silicone, wouldn't take much to delaminate over time..