Didn,t realise that the paphs where in s/h.
I must say i have had mixed results with my paphs in s/h.Dropping bottom leaves was 1 of the reasons i changed to different bark mixes.
My largest roth had just started a new growth when i checked it,s roots & there was stubs about 1 1/2" long , so into a bark mix he went.My Paph supardii(the base is so fat it,s got to be in bud soon) when unpotted had all it,s roots intact & there was a handful of active root ends actually in the res.
The supardii originally dropped bottom leaves but now it is working on leaf number 9.
Most of my paphs are roths or roth hybrds & are in various bark mixes to see what works for me & my conditions , maybe changing the type of LECA would give me more confidence to try some more in s/h again.