Ive never been convinced that terrariums are a great idea
at all..
IMO, the are just a holdout from the 70's who's time has past..
I dont think there is anything that could be grown in a terrarium that couldnt be grown better
outside of a terrarium..the only exception maybe being plants that need
really high humidity..but those are rare in the CP world..and there are better ways to provide extra humidity..
and most CPS dont really require extra humidity anyway..
Requiem,
personally I wouldnt bother with all the layers..
I have never understood when books and websites say "put gravel in the bottom for drainage" when you are then supposed to put finer stuff
on top of the gravel! which will then quickly work down into the big spaces between the gravel, totally negating any "good drainage properties" the gravel might have had..gravel is only good for drainage if you dont put anything else on top of it!
I would just go with a layer of peat..no real need for anything else..
and I agree with SK..if you want the "terrarium look" its far better to keep the plants in individual pots, then plant the whole pot in the terrarium..you can cover the pot rims with LFS so the individual pots arent seen..then you can take out individual plants as needed, without disrupting everything else..
IMO, you would be better off just not bothering with a terrarium at all..but thats just me..
If you want to grow neps that benefit from higher humidity, an enclosed "grow chamber" is IMO a better idea..you can have your plants on shelves, in pots, with light above, then encase the whole thing in plastic to hold in the humidity..much easier to control growing conditions that way..
IMO, CPs in general arent great candidates for terrariums..
most do far better outside a terrarium than inside one..
Scot