If no leaks yet then dont panic. take your time and find the right tank. If its another 93 cool if its something bigger well even cooler. I know it would look ugly but for the time being to make sure it doesnt leak you could lower the water in the tank and use silicone on the crack, let it dry and fill back up. Its just a safty thing and it might give you more time. You might also think about having that panel replaced. Check with a glass company and see if they would do it and what it would cost. Not the best idea but it could work. If your handy there are plenty of vids on you tube about how to replace glass or even making you own tank."Not something I would do" but there are plenty of people that do. There is even a large web site for DIY aquariums so you could find lots of help there