I had this happen to a 120 gallon tank except it drained completely all over the floor. What a nightmare that was. I decided at that point to get out of the fish keeping hobby. I sure do miss my big Oscar I had though. Raised him from a tiny baby and he was 14" long when the tank debacle happened. Fish tanks can be alot of work - I can't say I miss that part.
Good luck with your new tank.