Man that just ties my stomach in knots...I am truely sorry! I have went through a big mess like that not 5 months ago with a 240...then the replacement tank that I spent almost a month getting ready cracked...and the replacement after that!!! I was depressed...ready to kill people at the aquarium place!!! finally I have everything back to norm in the fishroom... it is a really depressing situation when you put so much into a tank like that only to cause more grief....looks like a real mess on your hands right now
just remember....now you have a second chance to redo it better....and in the end you will appreciate the tank that much more...although you will always be gun shy of it leaking again....its a condition any fishkeeper that has had a large tank leak or burst can never get out of their mind.
I am really sorry and hope all works out for the best....dont let it get you down, if anything it teaches patience and how to deal with a disaster