Marvin, please be careful, do not generalize "all neps from Philippines" because not all neps here are Epiphytes, N. alata (lowland) and N. Mirabilis like continually moist medium and not well drained.
Ken what does "overpotting" mean? Do not use too big pots?
Thanks guys for your feedbacks, comments and questions, I learned a lot and the initial data will be edited accordingly
TTFN
Arvin