I recently found a 17 litre (4.5 gallon) tank in my grandparents garage and wasn't sure what to do with it. It's pretty dirty and even had plants growing in the old filter compartment but do you think I could clean it up and set up a tank before the babies are born?
Don't rush it. You'll have to clean it thoroughly, set it up and let it cycle. You can just hope for the best. Like everyone said provide as much cover as you possibly can.
In the meantime, set the 4.5 gallon up!