Thanks!
I keep the following species:
Blaberus discoidalis, Blaptica dubia, Eurycotis opaca, Gromphadorhina portentosa, Gyna caffrorum, Gyna lurida, Phoetalia pallida, Princisia vanwaerebecki, Shelfordella lateralis, Therea olegrandjeani and Therea regularis.
Also some of my hissers look more like Gromphadorhina oblongonota but I'm not sure how to properly differentiate them from G. portentosa.