Are Paph. sanderianum s particularly difficult to grow?

[Jeff214]

Now that I've kept a few Paphs and Phrags alive for nearly a year... I'd like (perhaps foolishly) to try a Paph. sanderianum (or a hybrid with long petals). Are Paph. sanderianums tricky to grow compared to other species or require special care?

Since these are calcicolous, should they be potted in a medium that contains dolomitic limestone?

Paphiopedilum sanderianum

Thanks!