[jeff]

I use for all my mexican ping ( eventualy the hybrids ) a mineral substrate ( the base : clay and limestone) just to have a good draining , for them the air hygrometry ( 70-80%) is also more important .

sphagnum moss ( hydroponic substrate) or blond peat is just a horticutural substrate for the hybrids or some others , attention to the rot with this substrate .

to have a dormancy on the mexican keep them from 10 to 12 °c ( may be difficult in your country) from november to may often in dry condition

for the hybrid you can see the dormancy when they reduce their leave and when they become succulent ( often without 'mucilage' )

jeff