These mantis are very small, adult length approx - females 2cm and males 1.5cm, please ensure you have the correct sized enclosure for them and larger for each Haania you may add if going communal.
Currently fed on Springtails and tiny fruit flies -  current size approx 3mm
 
Temperatures
Day - 23 – 28°C
Ideal temp 26°c
Humidity 75-100%
Airflow is super important.
 
To keep humidity levels up I would advise a bioactive set up.
You can keep these guys communal, I personally do, but remember there is no guarantee that they won't cannibalize eachother if there is not enough food etc.