That was the reason I had to get everything away (several species of Blaberus,Eublaberus etc). It wasn't seem to be too bad at the begining but after some time it was getting really serious. The only species that I could eventually keep is Nauphoeta cinerea.
Just from my curiosity I offered her a locust which I caught aside and she reacted almost instantly. I didn`t expect that so picture is out of focus a little.
Just for the record this is my simple setup. It can produce much more than I need. I know crickets are not very popular on this forum but in my opinion they are the best alternative if roaches cannot be used. I used to keep many species of roaches before but I must forget them and had to give...