For fish, I plan on moving my gar into the tank, and hopefully getting an arowana. If everything works out, I plan on getting a (smaller) ray also. Other than that, just a few cichlids (the largest being a Jack Dempsy), a tiretrack eel, and a black ghost knifefish.
I looked up dimensions of a few retailers sites, and I figure I'd make 72x24x24
tank. (That's 180g.) How thick does the glass need to be? I found a site that says 1/2 inch? Does that sound right?