So.... now that the fish is in his hospital tank...
I've got a standard 55g tank with problems that can probably be fixed by the right person. That isn't me. But if it's you, you get a tank for free.
I figure the tank is leaking somewhere around 6" from the top. I dunno how else it could lose 6" of water in 24 hours and have that being a stable water height.
The tank also has scratches on the front glass (and probably the sides and back). I can't see the scratches easily when they're covered in water.
There's also calcification on the glass, again near the top of the tank.
The tank has been having a bad case of BGA, and before that, it was diatoms.
There are assorted salt encrustations at the moment.
If you'd like to take on the project of cleaning it up and possibly resealing it, the tank is yours. My husband will help you get it out of the basement and into your vehicle.
If you let me know your interest SOON, I'll deal with as much of the interior-tank work as I can. Otherwise, we'll start looking into finding a glass recycling place.