Hello. I will be feeding my Dumeril's on Thursday, and I do not like feeding live. I've heard of people putting rodents in a plastic container, and spraying some dust remover (or something like that) in the tub, which displaces the air, thus killing the rodents. I have everything ready to do so, but I need something to displace the air in the plastic container. Got ideas as to what I should use? Thanks in advanced.