In a big cage the temperature should be from the minimum to the maximum temperature, so that the mantis can choose the best temperature. But the maximum temperature should only be reached on a small spot.
In smaller cages should the middle between the max. and the min. temperatures be choosed.
When in winter plants of hardware/ garden stores are used, the ferns are often sprayed with pesticides. Thus the leaves have to be cut completely and just the regrwoed leaves can be used as food. Otherwise the animals can die because of the chemicals.