It probably just got old from being unused for so long, everything breaks at some point lol. I'd definitely try to reseal it and keep it. Just reseal it all then slowly fill it outside. Fill it part way and let it sit for a day. Then fill it the rest of the way and let it sit for a awhile.How risky is that? It seems like a big project because of the size of the tank. I would really like to know what cause it to happen in the first place. It is on a custom built stand that when I bought it... could that be warping the tank, causing the seems to burst?