dont ever mix species...EVER(with the exception of redfoots and yellow foots) most torts are all going to require different habitats an what one may need (humidity in the RFTs case) the other doesnt (your hermans) second they are likely from different breeders so you dont know what pathogens and bacteria they are carrying and it is possible that they can transfer these to other torts whom may not be able to resist and fight the bacteria causing your torts to get sick or possibly die...any herman from any breeder will carry different levels of deifferent pathogens and bacteria but if one herman can fight it/handle it another healthy herman can too...what a redfoot can handle/fight doesnt mean that hermans, sulcats, greeks, horsefields or any other tort can they are all different immune systems, digestive bacteria, respitory bactias and all that. redfoots and yellows are the same torts just different colors pretty much so that is why it is widely accepted that you can mix those species but even then some keepers insist that they still shouldnt be mixed...hope that explanation made sense