Madagascar Hissing Cockroaches

I'm not sure what you use for bedding/substrate at the moment, but the old bug staple of eggcrate might be useful. Most bugs will hide from bright light, so if you have a few stacked pieces of eggcrate on one end of the tank, they will hide in there most likely if you put them under a bright light, then you can remove the egg create and clean the rest of the tank, or shake all of the debris to one end and keep the eggcrate on the other, and sweep it out with a whisk type broom. I've never had hissers, but it has worked with many other types of insects.