I would get a good carbon whole house filter first, which would reduce the chlorine to a level that won't kill your fish. Would also be a good idea to have a filter on the return to the upper tank, to filter out algae, this one could be home made, using a plastic type filter media that can be...
I used to keep a pet tarantula and snakes when I was married to my first wife, over 40 years ago. She liked the snakes, but hated the tarantula. When I went to sea, (submarines) she did away with the tarantula. I used to feed it pinkie baby mice once in a while, until one started screaming...