Sorry to hear.
First thing is if there is water in the floor still, make sure there isn't any electricity that will be touching it etc.
You can put stuff in bins/buckets.
I had a 75g tank years ago that started leaking at a seam. It was towards the middle/top of the tank. I came home to a stream of water shooting about 5 feet into the living room.
I used duct tape to strengthen the corner enough for it to continue to hold water for a few months until I was able to find a better solution(selling my stuff in this case). I got it as tight as I could so that it would apply pressure. It was very ugly, I had duct tape all the way up and down the corner and about a ft more on the glass. Not sure if it was needed, but I wanted to put as much into it as I possible could.
It does need to be dry, so I had to wait until the water level was low enough. If your leak is at the bottom, this might not be a great idea for you.
I even filled it back up with water, and ran the tank normally for a few months. It was ugly on that corner, but it worked. I eventually sold the live stock/equipment and dumped the tank due to moving cross country.
No idea if I just got lucky with the fix or not, but I would for sure try it again if one of my tanks started leaking at the seam. If there was something you could put on the inside that might help, as the water would apply the pressure to it.