you wanted personal opinions on this im guessin. well thats basiclly what this site is for, and IMO i would never put even the shell casings of a bettle or whatever kind of bug, due to the fact that i dont think anyone know the rate they will take water in, and roots are fragile what says they can travel through these casings. you could become root bound easier i belive. and again this is all IMO so you are stuck with experiementing if you want. though if this is just a first time grow or even just a grow to have your personal and you dont have extra room to experiment, i wouldnt.