Jewel Orchids with Brown leaves

[Nish07]

Hi,

I recently purchased some Jewel Orchids (Macodes petola and Indra's Web.) I put these guys into a large tub and sealed it with a glass lid. The bottom of the tub had 1" expanded clay pellets with 1/4" water at the bottom. A couple began to grow quite well while a few others (which didn't look perfect to begin with) got worse. All started to get brown on some of their leaves while quite a few leaves were dying with holes in them. The temps in the room were 80 degrees daytime and 72 night. After a while I noticed a slug working its way around so I CO2 bombed the tub and let it sit for a day. After pulling the plants out of the pots to repot them I only found one other slug (both had died). I repotted the plants in new clean sphagnum (dry) in 3" net pots and dampened the sphag before placing them back into the tub.

Here are my questions:

1) Are the temps ok?

2) They're soaked with humidity in the tub. Is the humidity too much for them?

3) Would circulating air inside the tub be better for them

4) Could it just be the slugs causing the problems with the conditions mentioned above?

5) Would it help to use a dilute fertilizer on them and if so what kind, what dilution and how much/often?

Thanks,

-Nish