My only other final question is on humidity: Any reasoning why the pings in humid climates/terrariums have WAYY bigger leaves? Or is having a lowish humidity not really a problem for them?
do you know the name of these specie ?
big difference in size for example between gigantea and nivalis or medusinae , big difference also on their cultivate condition.
effect ,sizes can sometimes be attributed to the air of moisture rate. In-situ plants decrease their leaf surface and sometimes become succulent (becomes dormant) in the dry season between November and May.Dormancy for these plants is necessary, what is usually does not terrarium.
one thing can be important for the size, the taking insects .In fact insects are their fertilizer.
to your ping, one of the parent is a moranensis the size standard maxi for the summer leaves : length 115mm width 60 mm.