You can save weight and hassle by going to a local plastics
store and having sheets of diffraction grating cut to the size
of your trays. This is the stuff with 1/2" square holes in it,
and it's about 1/2" thick (sort of like a holey waffle). It
comes in white and chrome plated. The chrome looks nice but is
more expensive. I use this in my fishtank terrariumand it works
quite well at keeping the plants out of the water.
>>Now, onto my questions:
>> 2. This thing gives zero ventilation. I've read Neps love muggy
>> stagnant air. Is this true? If so, I know another plant
>> which loves stagnant air, too. Mold. Any good ideas on
>> preventing mold from developing?
You don't need zero ventilation. It basically depends on the N.
species (I grow N. ventricosa *outdoors* year round in the SF Bay
area). Lowland species will want 70-80 degree temps and high
humidity, but a little ventilation shouldn't hurt.
Robert