I prefer a slight cricket smell over roaches. They are too creepy. I also find that roaches tend to hide in the substrate if not grabbed immediately. I hatched out crickets in a plastic cup covered with saran wrap and held on by a rubber band. I just made a very small hole in the plastic to limit condensation. I sat the cup on the radiator which kept the substrate at 80-85F. An ultratherm heat pad on a rheostat should do the trick, too. The crickets seem to do best with some heat when they are first starting out.