The omicron cartridge is the best cartridge for bho but it isn't a direct fit in the atmos. I'm not very familiar with it but I'm guessing it is a 510 threading. I would try going to a LHS that carries e-cigs and see if a 510 adapter will fit on the atmos before ordering the adapter you would need to use omicron carts, chances are a LHS won't have the adapter you need. it is a 510 to 601