Wow! For those of us that didn't know you were in the service...This was a little hard to read...
It just sounded like it was going a different way.
Sell it, put the money in a savings account, when you are ready to get back in, you'll have a good start.
Just my .02
I used non-toxic kids modeling clay to make a large "Dam" around the hole-to-be.
One Diamond hole saw, cordless drill...patience...Perfect hole. I have now cut about 30.
I would say to go to a glass shop and pick up a piece the same thickness as the tank. Practice. Try and get a large piece...