I'm toying with the idea of just making ALL my roach bins into substrate with cork bark , dead leaves , etc etc ...... My question is , how do I change out the substrate on roach species that have nymphs that burrow and lets say you have 100's of them in the substrate ... there's gotta be an easier way than to sift out 4 inches of substrate and finding all 5,640 nymphs !!! I would love some reassurance on easier ways to do this ... thanks !