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Need advice, contemplating Blaberus giganteus enclosure

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I'll be copy/pasting this to two other places, and will link them up here in case anyone wants to see any other suggestions I might get. 




I have a 65 gallon aquarium standing empty except for a couple inches of water, and I think I want to make a giant cave roach habitat. But a really cool one- like the inside of a cave. I've been looking at pictures of their natural habitat, and they live in rainforest caves in Central America. I'm thinking of making a background that looks like fake rock, and providing light only from one smaller fixture, like the light is shining down through a hole in the ceiling. The substrate would be a nice, thick layer of coco fiber and hardwood leaves, and I'd put some wood in for them to chew on. 

My main concern is that the roaches will chew anything I use as a background. I don't want to use a cement background because it would be super heavy, and I don't want to work with clay, it's kind of a pain in large amounts. I'd thought about styrofoam with something over the top as sealant, but I'm worried the roaches would eat through the sealant and just start chewing. 

Who's kept these guys, and how do you keep them? Any sort of background?

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I have kept B. giganteus before, and the timing of this post is interesting. I submitted a PPQ-526 commercial biological supply permit application for this species, and it was just denied. To answer your questions, I never had them in a decorative cage as I got rid of my colony before it was ready to be displayed. When I kept them, I just had them in a bin with a couple inches of coconut coir substrate. I wonder, though, if you could make a background out of spray foam and then imbed sand or pebbles in it, so the roaches could not eat the foam. 

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