It probably did and still will, I wouldn't though. That's just me, 180g is alot of water if something went wrong as you don't know how hard that got hit and what may be lurking..
i think it would hold water fine but i would be wary as well, make sure the crack hasnt traveled and is actaully just that chip and the seller would have to make the price really reasonable to buy it. somewhere like less than half the price of original cost of the tank