IME it will crack and not explode. usually from a unlevel surface. With the old metal frame tanks the leak could be in the lower right rear corner but the water could come out almost anywhere, like the top right front. Most likely any leak will be found during the first fill (major) or within the first 24 hours (minor). I have even had a very small leak clog it's self, after several days.
When I fill a tank for the first time or move a tank, I fill it about 25% and check it for level. Then again at 50%. I'll bet i have had at least 50 different tanks over the last 30 years. Smallest was a 2 GAL
show up too a 240 GAL
custom, and I can remember only 3 as brand new. But every time I fill any aquarium it's the same, fill a little, check for leaks and fill a little more, ECT.
My latest is a 180 GAL
reef plexi and it has a 3" crack across the top extending into the the front by a 1/4". So I marked the ends of the crack before I filled it. Then checked while filling, after a year it is still the same. Before that I bought a 125 GAL
plexi where someone left the heater on when they drained the tank. With a burned spot on the bottom it took a little sanding, a scrap peice of plexi and some aquarium sealant it's good to go.