I use a Canadian peat mix w/perlite and bark. Fafard makes some good mixes. Try the 2S or 4S. They even include vermiculites. I dont have any guzmanias in my collection. I mainly grow neos and aechmeas with this mix, but I think it should work.

I know of certain proffesional growers who use Pinstrup Danish peat to grown their guzmanias. It retains a lot more moisture, but I think it might be difficult to find.

ok thanks. what are vermiculites btw?

vermiculites are additives that help the soil retain better moisture.