Hi I have a ?? I am thinking of using our cool mist humidifier that previously had lemongrass used in the diffuser tray that has since been totally cleaned out and no oils remain visible and I cant smell any, to humidify my BP's since what we had stopped working. We have wood heat they are in a glass tank in our main room as that is the only place big enough to house the tank, therefore it stays rather warm and the 3 of them continually want to crowd into the same water dish to cool off I suppose ? Would it be safe to use the diffuser for humidification for them as there is no oil residue in it and hasn't been in weeks ? I want to humidify them in a comfortable manner but cant get the system I want right now. Again the diffuser has been cleaned out top to bottom and no oils are on any surface, would it be safe or just best not to. the humidifier in ? was previously used in the room they are in with said oils and no adverse effects at all to them so idk ..................... help please any advice is welcome, they continually try to stay in the water they do not have mites all sheds have been complete with little to no help from me so I assume they are hot from the wood heat.