I definitely recommend some sort of overhead heater for that large of a space, but I also think that some sort of substrate heat would be a good idea as well.



The quick and easy choice is to just use a Kane or Stanfield heat pad that can be set directly in the cage. But they are more expensive.



For regular heat tape or UTH's that can't go directly in a tank I prefer to cut a rectangle out of the cage floor that is 2" wider and longer than the size of the heat source. Keep the cutout away from the walls so it does not overlap screws/nails and also so the structure of the floor itself is intact.



Then cover the entire floor with some sort of rigid plastic that the heat pad can be attached to from underneath. This keeps the heat source protected and also gives it an air space. It also makes the cage a bit lighter. The plastic makes the floor easier to clean.



If you use this idea be sure to route a groove for the electric cable to run through.
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Currently keeping a small collection of various Gonyosoma. Both G. janseni and G. oxycephala.

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