The hotel already stated, it won't be rebuild. The official reason being they would need to remove the atrium ceiling and work through the then open ceiling from some dozen metres up. If you just consider the size and weight of the glass ring, this simly can't be feasible. Originally, both hotel and fish tank had grown together. There may be more reasons, however I don't want to speculate on this. But one thing is for sure. This is and always has been a completely private project. So the senate wouldn't get any say in this either way. Apparently, the tank was installed by an American company back in the day. They will come over to investigate the damage. Not sure, if this is about money/legal aspects or reputation. But for the public, it won't make much of a difference now anyways.
To put it short, the Aquadome is lost for good as are most of the 1,500 animals (a few dozens were found on the ground of the tank and saved in buckets. Apparently, there are underground tanks for breeding (including rare species) with some more 500 fish. Unfortunately, the power had to be shut down immediately, though. So they didn't have any heating, added oxygen, electrical filtration etc. from minute one. But I heard, they still managed to save some animals from down there, too.