Poisonous plants are only a problem if the gecko decides to eat them, and philodendrons are poisonous.
I've never noticed any feeders consuming a plant, though it certainly sounds possible. Have you guys ever had it happen or are we just talking precautions here?
Has anyone used Chamaedorea elegans (Parlour Palm) in terrariums? I have read that it is safe and non-tonic on a number of websites.