You may have seen my other post with regards to my N. lowii that is in a bit of trouble lately (my fault). However, its led me to think about the size/shape of the post I'm using.
As I noted in my other post I have noticed that the smaller the pot the poorer the condition of the LFS (same LFS used in all pots and treated the same in terms of watering). I am basically using standard SHAPED pots in 3 sizes - 120mm, 150mm and 200mm (5", 6" and 8"). I generally size the pot to the plant based on its leaf/pitcher span.
My observation is that the smaller the pot the more water-logged the LFS seems to be and the more algae/slime grows with little LFS growth (no algae/slime on my larger pots and the LFS is growing very well).
My thinking is that it is to do with surface area exposed to air (i.e. better aeration and evaporation).
Then.... yesterday I bought a couple of mature Neps 30cm+ (12"+). Both have been grown in rather flat/shallow pots (peat/sand mix). So for the given volume of substrate there is more surface areas exposed to the air than in a deeper pot.
Any thoughts on this or am I over complicating the issue and just need to watch my watering in the smaller pots?
Note that I based on advice in the other post I am moving away from 100% LFS anyway, and going with a 1:1:1 LFS, Orchid bark, Perlite mix which seems MUCH better.