Please do not mix species. Its not a good idea. Sure they are all one family and all, but conflicts will occur. Mixing a firebelly toad with a treefrog will reult in the the tree frogs death because of the toxins. Fighting for food will occur which may resultt in death. Whether a species is diurnal or nocturnal does not justify mixing, it just worsens the problem. Some species harbour bacteria that may kill another species. Look at it this way, would you like to be put into a room with a serial killer... we are the same family aren't we...
Just my 50 cent