I removed the original (bad) patch job and here is what the crack looks like.
We plan on buying two pieces of 1/2" thick replacement glass (from https://www.onedayglass.com
) to go on top of the broken glass to cover the crack and the holes for the plumbing of the filtration system. (We're happy to give up the holes if it means we get a working tank back.)
FYI, the kindly movers who said they would send 4 men and only sent 3 rested the tank on the ground with a PVC
pipe still attached through one of the holes. That's what caused the crack.