My turtles, sulcata, & all the baby corn snakes are in 1 room (cat free). The 2 Chameleons are in my bedroom (also cat free). The 4 cats also have their own room so I can lock them up when I need to take care of the other pets. My living/dining room has the tanks for my 6 frogs, 2 toads, 1 salamander, 2 bearded dragons, 2 Mexican black king snakes, 5 adult corn snakes, 2 albino nelson milk snakes, 1 rosy boa, 3 fish, & 2 geckos. The snakes are all on cat-proof racks & they can't get into the other tanks. As far as room for them, line the walls & get rid of furniture until you have enough room for all the pets

. My apartment before my house literally had tanks lining every single wall including the kitchen.