Can't Believe I Haven't Posted Here Yet

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Hey, my name is Ron, some of you probably know me from Dendroboard. I've been a memmber here for quite a while but i just got my first two Orchids (Haraella odorata and Masdevallia nidifica from Andy's) so now i have a reason to post.

Warning: Newbie questions coming up!

The H odorata i got is stick mounted with some sphagnum moss. I'll be putting it in a small vivarium that will house a pair of D. intermedius so the humidities will be %75 or higher. When i mount it to the corkbark in the tank should i leave off the sphag ang just tie it right to the cork or is the sphag still required in high humidities?

The M nidifica is larger than i expected and i'd like to split it up if possible. Can i just cut the root ball into quarters with a sharp knife? This plant is in a pot and i want to mount it in cork also, should i use sphag for this one or not?

Thanks,
-Ron