I have two paphs division that were given to me almost a year ago. There were only two leaves to each and there are still only two nice green leaves. No growth whats-so-ever. They are kept indoors in a East facing window. My potting mix is: 2 pt fine bark, 1 pt med perlite, 1 pt charcoal and 1 tbls oyster shell. Moist by not soaking wet. What can I do to make they grow?